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Volumn 74, Issue 11, 2009, Pages 4080-4093

Combined directed remote metalation-transition metal catalyzed cross coupling strategies: The total synthesis of the aglycones of the gilvocarcins V, M, and E and arnottin I

Author keywords

[No Author keywords available]

Indexed keywords

AGLYCONES; CARBAMOYL; CHEMICAL EQUATIONS; CROSS-COUPLING; EFFICIENT SYNTHESIS; GILVOCARCINS; JUGLONE; LATE STAGE; LESSONS LEARNED; METALATION; MIGRATION PROCESS; MIGRATION STRATEGY; NATURAL PRODUCTS; NATURALLY OCCURRING; PROTECTING GROUP; STILLE COUPLING; SUZUKI COUPLING REACTION; TOTAL SYNTHESIS; TRIFLATE; VINYL GROUP;

EID: 66249141970     PISSN: 00223263     EISSN: None     Source Type: Journal    
DOI: 10.1021/jo9001454     Document Type: Article
Times cited : (88)

References (163)
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    • For example, Findlay's route (see ref 26a) furnishes an arylbromide precursor to a Suzuki coupling in 3 steps but is not selectively protected and requires a protection-deprotection sequence late in the synthesis. The synthesis by Jung provides a differentially protected arylboronic acid Suzuki precursor in 5 steps and ca 67% yield; however, the boronic acid is used in crude form and the overall yield is not known (see ref 26d)
    • For example, Findlay's route (see ref 26a) furnishes an arylbromide precursor to a Suzuki coupling in 3 steps but is not selectively protected and requires a protection-deprotection sequence late in the synthesis. The synthesis by Jung provides a differentially protected arylboronic acid Suzuki precursor in 5 steps and ca 67% yield; however, the boronic acid is used in crude form and the overall yield is not known (see ref 26d).
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    • Full details of the routes pursued, their rationale and lessons learned are given in the Supporting Information (Section 1)
    • Full details of the routes pursued, their rationale and lessons learned are given in the Supporting Information (Section 1).
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    • This work was encouraged by the previously demonstrated stability of isopropyl ethers under LDA mediated carbamate DreM rearrangements (ref 1) as well as model studies (ref 51, p 77.)
    • This work was encouraged by the previously demonstrated stability of isopropyl ethers under LDA mediated carbamate DreM rearrangements (ref 1) as well as model studies (ref 51, p 77.)
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    • note
    • That the improved yield of 33d ⇁ 38 (combined process) vs 33d ⇁ 37 ⇁ 38 (stepwise) results from the portion-wise introduction of LDA is supported by the relative amounts of C-5 phenolic products observed for the former reaction compared to the corresponding reactions of 33a and 33c. However, this suggestion is speculative since an experiment with the same substrate using the two different sets of DReM conditions, and to a common product was not carried out. Furthermore, a detailed analysis of DReM reaction products of 33d was not performed due to the relatively less straightforward (cf. Scheme 8 and 9) purification of the reaction mixtures and the instability of some fractions on silica gel.
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    • DreM reactions of 33b were as complex as those of 33a, yielding several C5-phenolic products. The subsequent successful use of a C4′- MOM PG in 33c provided the impetus for its deployment for the protection of 49c (Scheme 14). See also ref 53
    • DreM reactions of 33b were as complex as those of 33a, yielding several C5-phenolic products. The subsequent successful use of a C4′- MOM PG in 33c provided the impetus for its deployment for the protection of 49c (Scheme 14). See also ref 53.
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