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Volumn 64, Issue 14, 1999, Pages 5109-5115

One-pot reactions of N-(mesyloxy)phthalimides with secondary amines to 2-ureidobenzamides, 2-ureidobenzoic acids, ethyl 2-ureidobenzoates, or isatoic anhydrides

Author keywords

[No Author keywords available]

Indexed keywords

2 UREIDOBENZAMIDE; 2 UREIDOBENZOIC ACID; 2 UREIDOBENZOIC ACID ETHYL ESTER; BENZAMIDE DERIVATIVE; PHTHALIMIDE DERIVATIVE; UNCLASSIFIED DRUG;

EID: 0038761764     PISSN: 00223263     EISSN: None     Source Type: Journal    
DOI: 10.1021/jo9900634     Document Type: Article
Times cited : (33)

References (49)
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    • Other synthetic routes to I (R, R′ ≠ H): (a) From anthranilic acid via 2-benzotriazolyl-4H-3,1- benzoxazin-4-one: Butula, I.; Vela, V.; Zorc, B. Croat. Chem. Acta 1981, 54, 105. (b) From isatoic anhydride via 2-isothiocyanatobenzoyl chloride: Ulrich, H.; Tucker, B.; Sayigh, A. A. R. J. Org. Chem. 1967, 32, 4052. (c) From methyl 2-aminobenzoate via 2-methoxycarbonylphenylcarbamoyl chloride: ref 1. (d) From methyl 2-aminobenzoate and phosgene-iminium salts: Bitter, I.; Szöcs. L.; Töke, L. Acta Chim. Acad. Hung. 1981, 107, 57.
    • (1981) Croat. Chem. Acta , vol.54 , pp. 105
    • Butula, I.1    Vela, V.2    Zorc, B.3
  • 13
    • 0006353142 scopus 로고
    • Other synthetic routes to I (R, R′ ≠ H): (a) From anthranilic acid via 2-benzotriazolyl-4H-3,1- benzoxazin-4-one: Butula, I.; Vela, V.; Zorc, B. Croat. Chem. Acta 1981, 54, 105. (b) From isatoic anhydride via 2-isothiocyanatobenzoyl chloride: Ulrich, H.; Tucker, B.; Sayigh, A. A. R. J. Org. Chem. 1967, 32, 4052. (c) From methyl 2-aminobenzoate via 2-methoxycarbonylphenylcarbamoyl chloride: ref 1. (d) From methyl 2-aminobenzoate and phosgene-iminium salts: Bitter, I.; Szöcs. L.; Töke, L. Acta Chim. Acad. Hung. 1981, 107, 57.
    • (1967) J. Org. Chem. , vol.32 , pp. 4052
    • Ulrich, H.1    Tucker, B.2    Sayigh, A.A.R.3
  • 14
    • 85069124816 scopus 로고    scopus 로고
    • note
    • Other synthetic routes to I (R, R′ ≠ H): (a) From anthranilic acid via 2-benzotriazolyl-4H-3,1- benzoxazin-4-one: Butula, I.; Vela, V.; Zorc, B. Croat. Chem. Acta 1981, 54, 105. (b) From isatoic anhydride via 2-isothiocyanatobenzoyl chloride: Ulrich, H.; Tucker, B.; Sayigh, A. A. R. J. Org. Chem. 1967, 32, 4052. (c) From methyl 2-aminobenzoate via 2-methoxycarbonylphenylcarbamoyl chloride: ref 1. (d) From methyl 2-aminobenzoate and phosgene-iminium salts: Bitter, I.; Szöcs. L.; Töke, L. Acta Chim. Acad. Hung. 1981, 107, 57.
  • 15
    • 0002864424 scopus 로고
    • Other synthetic routes to I (R, R′ ≠ H): (a) From anthranilic acid via 2-benzotriazolyl-4H-3,1- benzoxazin-4-one: Butula, I.; Vela, V.; Zorc, B. Croat. Chem. Acta 1981, 54, 105. (b) From isatoic anhydride via 2-isothiocyanatobenzoyl chloride: Ulrich, H.; Tucker, B.; Sayigh, A. A. R. J. Org. Chem. 1967, 32, 4052. (c) From methyl 2-aminobenzoate via 2-methoxycarbonylphenylcarbamoyl chloride: ref 1. (d) From methyl 2-aminobenzoate and phosgene-iminium salts: Bitter, I.; Szöcs. L.; Töke, L. Acta Chim. Acad. Hung. 1981, 107, 57.
    • (1981) Acta Chim. Acad. Hung. , vol.107 , pp. 57
    • Bitter, I.1    Szöcs, L.2    Töke, L.3
  • 16
    • 33947569039 scopus 로고
    • The reaction of isatoic anhydrides with amines (or alcohols) produce two different types of products, 2-aminobenzamides (or alkyl esters) and 2-ureidobenzoic acids (or 2-alkoxycarbonylaminobenzoic acids) depending on the nucleophile and the reaction conditions. For examples see: (a) Staiger, R. P.; Wagner, E. C. J. Org. Chem. 1953, 18, 1427. (b) Bunnett, J. F.; Naff, M. B. J. Am. Chem. Soc. 1966, 88, 4001. (c) Hegarty, A. F.; Ahern, E. P.; Frost, L. N.; Hegarthy, C. N. J. Chem. Soc., Perkin Trans. 2 1990, 1935. (d) Coppola, G. M. Synthesis 1980, 505. (e) Kappe, T.; Stadlbauer, W. Adv. Heterocycl. Chem. 1981, 28, 127. (f) Heyman, D. J. Heterocycl. Chem. 1978, 15, 1131. (g) Hinman, C.; Vaughan, K. Synthesis 1980, 719.
    • (1953) J. Org. Chem. , vol.18 , pp. 1427
    • Staiger, R.P.1    Wagner, E.C.2
  • 17
    • 0344434802 scopus 로고
    • The reaction of isatoic anhydrides with amines (or alcohols) produce two different types of products, 2-aminobenzamides (or alkyl esters) and 2-ureidobenzoic acids (or 2-alkoxycarbonylaminobenzoic acids) depending on the nucleophile and the reaction conditions. For examples see: (a) Staiger, R. P.; Wagner, E. C. J. Org. Chem. 1953, 18, 1427. (b) Bunnett, J. F.; Naff, M. B. J. Am. Chem. Soc. 1966, 88, 4001. (c) Hegarty, A. F.; Ahern, E. P.; Frost, L. N.; Hegarthy, C. N. J. Chem. Soc., Perkin Trans. 2 1990, 1935. (d) Coppola, G. M. Synthesis 1980, 505. (e) Kappe, T.; Stadlbauer, W. Adv. Heterocycl. Chem. 1981, 28, 127. (f) Heyman, D. J. Heterocycl. Chem. 1978, 15, 1131. (g) Hinman, C.; Vaughan, K. Synthesis 1980, 719.
    • (1966) J. Am. Chem. Soc. , vol.88 , pp. 4001
    • Bunnett, J.F.1    Naff, M.B.2
  • 18
    • 37049067970 scopus 로고
    • The reaction of isatoic anhydrides with amines (or alcohols) produce two different types of products, 2-aminobenzamides (or alkyl esters) and 2-ureidobenzoic acids (or 2-alkoxycarbonylaminobenzoic acids) depending on the nucleophile and the reaction conditions. For examples see: (a) Staiger, R. P.; Wagner, E. C. J. Org. Chem. 1953, 18, 1427. (b) Bunnett, J. F.; Naff, M. B. J. Am. Chem. Soc. 1966, 88, 4001. (c) Hegarty, A. F.; Ahern, E. P.; Frost, L. N.; Hegarthy, C. N. J. Chem. Soc., Perkin Trans. 2 1990, 1935. (d) Coppola, G. M. Synthesis 1980, 505. (e) Kappe, T.; Stadlbauer, W. Adv. Heterocycl. Chem. 1981, 28, 127. (f) Heyman, D. J. Heterocycl. Chem. 1978, 15, 1131. (g) Hinman, C.; Vaughan, K. Synthesis 1980, 719.
    • (1990) J. Chem. Soc., Perkin Trans. 2 , pp. 1935
    • Hegarty, A.F.1    Ahern, E.P.2    Frost, L.N.3    Hegarthy, C.N.4
  • 19
    • 85069762576 scopus 로고
    • The reaction of isatoic anhydrides with amines (or alcohols) produce two different types of products, 2-aminobenzamides (or alkyl esters) and 2-ureidobenzoic acids (or 2-alkoxycarbonylaminobenzoic acids) depending on the nucleophile and the reaction conditions. For examples see: (a) Staiger, R. P.; Wagner, E. C. J. Org. Chem. 1953, 18, 1427. (b) Bunnett, J. F.; Naff, M. B. J. Am. Chem. Soc. 1966, 88, 4001. (c) Hegarty, A. F.; Ahern, E. P.; Frost, L. N.; Hegarthy, C. N. J. Chem. Soc., Perkin Trans. 2 1990, 1935. (d) Coppola, G. M. Synthesis 1980, 505. (e) Kappe, T.; Stadlbauer, W. Adv. Heterocycl. Chem. 1981, 28, 127. (f) Heyman, D. J. Heterocycl. Chem. 1978, 15, 1131. (g) Hinman, C.; Vaughan, K. Synthesis 1980, 719.
    • (1980) Synthesis , pp. 505
    • Coppola, G.M.1
  • 20
    • 0010679653 scopus 로고
    • The reaction of isatoic anhydrides with amines (or alcohols) produce two different types of products, 2-aminobenzamides (or alkyl esters) and 2-ureidobenzoic acids (or 2-alkoxycarbonylaminobenzoic acids) depending on the nucleophile and the reaction conditions. For examples see: (a) Staiger, R. P.; Wagner, E. C. J. Org. Chem. 1953, 18, 1427. (b) Bunnett, J. F.; Naff, M. B. J. Am. Chem. Soc. 1966, 88, 4001. (c) Hegarty, A. F.; Ahern, E. P.; Frost, L. N.; Hegarthy, C. N. J. Chem. Soc., Perkin Trans. 2 1990, 1935. (d) Coppola, G. M. Synthesis 1980, 505. (e) Kappe, T.; Stadlbauer, W. Adv. Heterocycl. Chem. 1981, 28, 127. (f) Heyman, D. J. Heterocycl. Chem. 1978, 15, 1131. (g) Hinman, C.; Vaughan, K. Synthesis 1980, 719.
    • (1981) Adv. Heterocycl. Chem. , vol.28 , pp. 127
    • Kappe, T.1    Stadlbauer, W.2
  • 21
    • 0001376459 scopus 로고
    • The reaction of isatoic anhydrides with amines (or alcohols) produce two different types of products, 2-aminobenzamides (or alkyl esters) and 2-ureidobenzoic acids (or 2-alkoxycarbonylaminobenzoic acids) depending on the nucleophile and the reaction conditions. For examples see: (a) Staiger, R. P.; Wagner, E. C. J. Org. Chem. 1953, 18, 1427. (b) Bunnett, J. F.; Naff, M. B. J. Am. Chem. Soc. 1966, 88, 4001. (c) Hegarty, A. F.; Ahern, E. P.; Frost, L. N.; Hegarthy, C. N. J. Chem. Soc., Perkin Trans. 2 1990, 1935. (d) Coppola, G. M. Synthesis 1980, 505. (e) Kappe, T.; Stadlbauer, W. Adv. Heterocycl. Chem. 1981, 28, 127. (f) Heyman, D. J. Heterocycl. Chem. 1978, 15, 1131. (g) Hinman, C.; Vaughan, K. Synthesis 1980, 719.
    • (1978) J. Heterocycl. Chem. , vol.15 , pp. 1131
    • Heyman, D.1
  • 22
    • 0342303245 scopus 로고
    • The reaction of isatoic anhydrides with amines (or alcohols) produce two different types of products, 2-aminobenzamides (or alkyl esters) and 2-ureidobenzoic acids (or 2-alkoxycarbonylaminobenzoic acids) depending on the nucleophile and the reaction conditions. For examples see: (a) Staiger, R. P.; Wagner, E. C. J. Org. Chem. 1953, 18, 1427. (b) Bunnett, J. F.; Naff, M. B. J. Am. Chem. Soc. 1966, 88, 4001. (c) Hegarty, A. F.; Ahern, E. P.; Frost, L. N.; Hegarthy, C. N. J. Chem. Soc., Perkin Trans. 2 1990, 1935. (d) Coppola, G. M. Synthesis 1980, 505. (e) Kappe, T.; Stadlbauer, W. Adv. Heterocycl. Chem. 1981, 28, 127. (f) Heyman, D. J. Heterocycl. Chem. 1978, 15, 1131. (g) Hinman, C.; Vaughan, K. Synthesis 1980, 719.
    • (1980) Synthesis , pp. 719
    • Hinman, C.1    Vaughan, K.2
  • 23
    • 85069122091 scopus 로고    scopus 로고
    • note
    • N-(Mesyloxy)phthalimide was reported to react with piperidine to the analogue 2-ureidobenzamide derivative; see ref 14.
  • 25
    • 84982367300 scopus 로고
    • The reaction of N-(sulfonyloxy)phthalimides with primary amines as well as O-, S-, and C-nucleophiles has widely been utilized in organic syntheses. For examples, see: (a) Bauer, L.; Exner, O. Angew. Chem., Int. Ed. Engl. 1974, 13, 376. (b) Fahmy, A., F. M.; Aly, N. F.; Nada, A.; Aly, N. Y. Bull. Chem. Soc. Jpn. 1977, 50, 2678. (c) Fahmy, A. F. M.; Aly, N. F.; Orabi, M. O. Bull. Chem. Soc. Jpn. 1978, 150, 2148. (d) Gütschow, M.; Tonew, E.; Leistner, S. Pharmazie 1995, 50, 672. (e) Chapman, T. M.; Freedman, E. A. J. Org. Chem. 1973, 38, 3908. (f) Sheradsky, T.; Itzhak, N. J. Chem. Soc., Perkin Trans. 1 1986, 13. See also ref 14. For an application of the Lossen rearrangement of N-(sulfonyloxy)phthalimides in the design of mechanism-based inhibitors of serine proteases, see ref 16.
    • (1974) Angew. Chem., Int. Ed. Engl. , vol.13 , pp. 376
    • Bauer, L.1    Exner, O.2
  • 26
    • 0001013529 scopus 로고
    • The reaction of N-(sulfonyloxy)phthalimides with primary amines as well as O-, S-, and C-nucleophiles has widely been utilized in organic syntheses. For examples, see: (a) Bauer, L.; Exner, O. Angew. Chem., Int. Ed. Engl. 1974, 13, 376. (b) Fahmy, A., F. M.; Aly, N. F.; Nada, A.; Aly, N. Y. Bull. Chem. Soc. Jpn. 1977, 50, 2678. (c) Fahmy, A. F. M.; Aly, N. F.; Orabi, M. O. Bull. Chem. Soc. Jpn. 1978, 150, 2148. (d) Gütschow, M.; Tonew, E.; Leistner, S. Pharmazie 1995, 50, 672. (e) Chapman, T. M.; Freedman, E. A. J. Org. Chem. 1973, 38, 3908. (f) Sheradsky, T.; Itzhak, N. J. Chem. Soc., Perkin Trans. 1 1986, 13. See also ref 14. For an application of the Lossen rearrangement of N-(sulfonyloxy)phthalimides in the design of mechanism-based inhibitors of serine proteases, see ref 16.
    • (1977) Bull. Chem. Soc. Jpn. , vol.50 , pp. 2678
    • Fahmy, A.F.M.1    Aly, N.F.2    Nada, A.3    Aly, N.Y.4
  • 27
    • 0242555216 scopus 로고
    • The reaction of N-(sulfonyloxy)phthalimides with primary amines as well as O-, S-, and C-nucleophiles has widely been utilized in organic syntheses. For examples, see: (a) Bauer, L.; Exner, O. Angew. Chem., Int. Ed. Engl. 1974, 13, 376. (b) Fahmy, A., F. M.; Aly, N. F.; Nada, A.; Aly, N. Y. Bull. Chem. Soc. Jpn. 1977, 50, 2678. (c) Fahmy, A. F. M.; Aly, N. F.; Orabi, M. O. Bull. Chem. Soc. Jpn. 1978, 150, 2148. (d) Gütschow, M.; Tonew, E.; Leistner, S. Pharmazie 1995, 50, 672. (e) Chapman, T. M.; Freedman, E. A. J. Org. Chem. 1973, 38, 3908. (f) Sheradsky, T.; Itzhak, N. J. Chem. Soc., Perkin Trans. 1 1986, 13. See also ref 14. For an application of the Lossen rearrangement of N-(sulfonyloxy)phthalimides in the design of mechanism-based inhibitors of serine proteases, see ref 16.
    • (1978) Bull. Chem. Soc. Jpn. , vol.150 , pp. 2148
    • Fahmy, A.F.M.1    Aly, N.F.2    Orabi, M.O.3
  • 28
    • 0028820234 scopus 로고
    • The reaction of N-(sulfonyloxy)phthalimides with primary amines as well as O-, S-, and C-nucleophiles has widely been utilized in organic syntheses. For examples, see: (a) Bauer, L.; Exner, O. Angew. Chem., Int. Ed. Engl. 1974, 13, 376. (b) Fahmy, A., F. M.; Aly, N. F.; Nada, A.; Aly, N. Y. Bull. Chem. Soc. Jpn. 1977, 50, 2678. (c) Fahmy, A. F. M.; Aly, N. F.; Orabi, M. O. Bull. Chem. Soc. Jpn. 1978, 150, 2148. (d) Gütschow, M.; Tonew, E.; Leistner, S. Pharmazie 1995, 50, 672. (e) Chapman, T. M.; Freedman, E. A. J. Org. Chem. 1973, 38, 3908. (f) Sheradsky, T.; Itzhak, N. J. Chem. Soc., Perkin Trans. 1 1986, 13. See also ref 14. For an application of the Lossen rearrangement of N-(sulfonyloxy)phthalimides in the design of mechanism-based inhibitors of serine proteases, see ref 16.
    • (1995) Pharmazie , vol.50 , pp. 672
    • Gütschow, M.1    Tonew, E.2    Leistner, S.3
  • 29
    • 0003599837 scopus 로고
    • The reaction of N-(sulfonyloxy)phthalimides with primary amines as well as O-, S-, and C-nucleophiles has widely been utilized in organic syntheses. For examples, see: (a) Bauer, L.; Exner, O. Angew. Chem., Int. Ed. Engl. 1974, 13, 376. (b) Fahmy, A., F. M.; Aly, N. F.; Nada, A.; Aly, N. Y. Bull. Chem. Soc. Jpn. 1977, 50, 2678. (c) Fahmy, A. F. M.; Aly, N. F.; Orabi, M. O. Bull. Chem. Soc. Jpn. 1978, 150, 2148. (d) Gütschow, M.; Tonew, E.; Leistner, S. Pharmazie 1995, 50, 672. (e) Chapman, T. M.; Freedman, E. A. J. Org. Chem. 1973, 38, 3908. (f) Sheradsky, T.; Itzhak, N. J. Chem. Soc., Perkin Trans. 1 1986, 13. See also ref 14. For an application of the Lossen rearrangement of N-(sulfonyloxy)phthalimides in the design of mechanism-based inhibitors of serine proteases, see ref 16.
    • (1973) J. Org. Chem. , vol.38 , pp. 3908
    • Chapman, T.M.1    Freedman, E.A.2
  • 30
    • 37049086434 scopus 로고
    • The reaction of N-(sulfonyloxy)phthalimides with primary amines as well as O-, S-, and C-nucleophiles has widely been utilized in organic syntheses. For examples, see: (a) Bauer, L.; Exner, O. Angew. Chem., Int. Ed. Engl. 1974, 13, 376. (b) Fahmy, A., F. M.; Aly, N. F.; Nada, A.; Aly, N. Y. Bull. Chem. Soc. Jpn. 1977, 50, 2678. (c) Fahmy, A. F. M.; Aly, N. F.; Orabi, M. O. Bull. Chem. Soc. Jpn. 1978, 150, 2148. (d) Gütschow, M.; Tonew, E.; Leistner, S. Pharmazie 1995, 50, 672. (e) Chapman, T. M.; Freedman, E. A. J. Org. Chem. 1973, 38, 3908. (f) Sheradsky, T.; Itzhak, N. J. Chem. Soc., Perkin Trans. 1 1986, 13. See also ref 14. For an application of the Lossen rearrangement of N-(sulfonyloxy)phthalimides in the design of mechanism-based inhibitors of serine proteases, see ref 16.
    • (1986) J. Chem. Soc., Perkin Trans. 1 , pp. 13
    • Sheradsky, T.1    Itzhak, N.2
  • 32
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    • For a review on E1cB processes in acyl transfer reactions, see: Williams, A.; Douglas, K. T. Chem. Rev. 1975, 75, 627. See also: Gütschow, M.; Hecker, T.; Eger, K. Synthesis 1999, 410.
    • (1975) Chem. Rev. , vol.75 , pp. 627
    • Williams, A.1    Douglas, K.T.2
  • 33
    • 0038761777 scopus 로고    scopus 로고
    • For a review on E1cB processes in acyl transfer reactions, see: Williams, A.; Douglas, K. T. Chem. Rev. 1975, 75, 627. See also: Gütschow, M.; Hecker, T.; Eger, K. Synthesis 1999, 410.
    • (1999) Synthesis , pp. 410
    • Gütschow, M.1    Hecker, T.2    Eger, K.3
  • 34
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    • note
    • For the formation of mesoionic quinazolines from 2-isocyanatobenzamides, see ref 14.
  • 36
    • 0014952612 scopus 로고
    • For the interdependence of intramolecular hydrogen bonding and intramolecular general catalysis, see: (a) Benkovic, S. J., Dunikoski, L. K., Jr. Biochemistry 1970, 9, 1390. For intramolecular acid catalysis of the hydrolysis of 3,1-benzoxazin-4-ones by a neighboring carboxyl group, see: (b) Hegarty, A. F.; Pratt, R. F.; Giudici, T.; Bruice, T. C. J. Am. Chem. Soc. 1971, 93, 1428. (c) Cremin, D. J.; Hegarty, A. F. J. Chem. Soc., Perkin Trans. 2 1978, 208.
    • (1970) Biochemistry , vol.9 , pp. 1390
    • Benkovic, S.J.1    Dunikoski L.K., Jr.2
  • 37
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    • For the interdependence of intramolecular hydrogen bonding and intramolecular general catalysis, see: (a) Benkovic, S. J., Dunikoski, L. K., Jr. Biochemistry 1970, 9, 1390. For intramolecular acid catalysis of the hydrolysis of 3,1-benzoxazin-4-ones by a neighboring carboxyl group, see: (b) Hegarty, A. F.; Pratt, R. F.; Giudici, T.; Bruice, T. C. J. Am. Chem. Soc. 1971, 93, 1428. (c) Cremin, D. J.; Hegarty, A. F. J. Chem. Soc., Perkin Trans. 2 1978, 208.
    • (1971) J. Am. Chem. Soc. , vol.93 , pp. 1428
    • Hegarty, A.F.1    Pratt, R.F.2    Giudici, T.3    Bruice, T.C.4
  • 38
    • 37049109104 scopus 로고
    • For the interdependence of intramolecular hydrogen bonding and intramolecular general catalysis, see: (a) Benkovic, S. J., Dunikoski, L. K., Jr. Biochemistry 1970, 9, 1390. For intramolecular acid catalysis of the hydrolysis of 3,1-benzoxazin-4-ones by a neighboring carboxyl group, see: (b) Hegarty, A. F.; Pratt, R. F.; Giudici, T.; Bruice, T. C. J. Am. Chem. Soc. 1971, 93, 1428. (c) Cremin, D. J.; Hegarty, A. F. J. Chem. Soc., Perkin Trans. 2 1978, 208.
    • (1978) J. Chem. Soc., Perkin Trans. 2 , pp. 208
    • Cremin, D.J.1    Hegarty, A.F.2
  • 39
    • 85069122681 scopus 로고    scopus 로고
    • note
    • Relevant NOE enhancements in 4 and 11: (Formula Presented)
  • 40
    • 0040687197 scopus 로고
    • Isatoic anhydride was obtained from benzoic acids with an adjacent carbamate residue under basic conditions or on thermal treatment: (a) Frost, L. N.; Hegarty, A. F. J. Chem. Soc., Chem. Commun. 1973, 82. (b) Hegarty, A. F.; Frost, L. N.; Cremin, D. J. Chem. Soc., Perkin Trans. 2 1974, 1249. See also ref 12f.
    • (1973) J. Chem. Soc., Chem. Commun. , pp. 82
    • Frost, L.N.1    Hegarty, A.F.2
  • 41
    • 37049140642 scopus 로고
    • Isatoic anhydride was obtained from benzoic acids with an adjacent carbamate residue under basic conditions or on thermal treatment: (a) Frost, L. N.; Hegarty, A. F. J. Chem. Soc., Chem. Commun. 1973, 82. (b) Hegarty, A. F.; Frost, L. N.; Cremin, D. J. Chem. Soc., Perkin Trans. 2 1974, 1249. See also ref 12f.
    • (1974) J. Chem. Soc., Perkin Trans. 2 , pp. 1249
    • Hegarty, A.F.1    Frost, L.N.2    Cremin, D.3
  • 42
    • 85069122631 scopus 로고    scopus 로고
    • note
    • 2Et, CONRR′, and Me, respectively, and compared to the observed values. The shift differences were 0.77-0.85 ppm for 2-ureidobenzamides (4, 5, 7-10), 1.09-1.19 ppm for 2-ureidobenzoic acids (11-14), and 1.16-1.32 ppm for ethyl 2-ureidobenzoates (15-18).
  • 46
    • 85069122964 scopus 로고    scopus 로고
    • note
    • + - NRR′ - HNRR′).
  • 47
    • 85069122893 scopus 로고    scopus 로고
    • note
    • + - HNRR′ - NRR′).


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