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Volumn 56, Issue 9, 2017, Pages 2482-2486

Rhodium-Catalyzed Decarbonylative Borylation of Aromatic Thioesters for Facile Diversification of Aromatic Carboxylic Acids

Author keywords

borylation; carboxylic acids; decarbonylation; rhodium catalysts; thioesters

Indexed keywords

AROMATIC COMPOUNDS; AROMATIZATION; CARBOXYLIC ACIDS; CATALYSTS;

EID: 85011387389     PISSN: 14337851     EISSN: 15213773     Source Type: Journal    
DOI: 10.1002/anie.201611974     Document Type: Article
Times cited : (87)

References (87)
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    • A highly reproducible result was also obtained using a preheated (80 °C, 1 h) mixture of [Rh(OH)(cod)], (5 mol %), P(, n, Bu), (10 mol %)KOAc (20 mol %) in CPME, indicating that using an excessive amount of the ligand is avoidable (Supporting Information, Scheme S1)
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    • Borylation of thioester 2 ao bearing a phenyl ester moiety did not afford 3 ao, and instead, S-ethyl 4-borylbenzoate 2 o (27 %) and diborylbenzene 3 o (34 %) were obtained (Supporting Information, Scheme S3), indicating that the phenyl ester moiety is more reactive than the thioester moiety under these conditions
    • Borylation of thioester 2 ao bearing a phenyl ester moiety did not afford 3 ao, and instead, S-ethyl 4-borylbenzoate 2 o (27 %) and diborylbenzene 3 o (34 %) were obtained (Supporting Information, Scheme S3), indicating that the phenyl ester moiety is more reactive than the thioester moiety under these conditions.
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    • We have detected carbon monoxide in the gas phase of the reaction vial using a gas detector tube. See the Supporting Information for details
    • We have detected carbon monoxide in the gas phase of the reaction vial using a gas detector tube. See the Supporting Information for details.
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    • At this stage, we cannot exclude the possibility that the reaction begins with oxidative addition of thioester 2 to the rhodium center, followed by transmetalation with diboron 4 a to afford V. For preliminary mechanistic studies, see the Supporting Information (Scheme S4 and Figure S1).
    • At this stage, we cannot exclude the possibility that the reaction begins with oxidative addition of thioester 2 to the rhodium center, followed by transmetalation with diboron 4 a to afford V. For preliminary mechanistic studies, see the Supporting Information (Scheme S4 and Figure S1).
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    • Decarbonylation of carbonyl compounds such as aldehydes typically requires more than equimolar amounts of rhodium complex because of deactivation of the complex by coordination of carbon monoxide to the rhodium center. The reaction at a temperature higher than 180 °C enabled decarbonylation with a catalytic amount of the rhodium complex. See: Refs [13b] and [13c].
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    • The borylation of 2 a using [Rh(OAc)(cod)], instead of [Rh(OH)(cod)], without KOAc gave 3 a in 24 % yield (Supporting Information, Table S3, entry 5). This result implies that the acetate bound to the rhodium center was trapped as pinB-OAc after the transmetalation step (Scheme 2 A III, (X=OAc) + 4 a to IV)thus, the acetate could no longer participate in the reaction. Therefore, we believe that the transmetalation occurs not from rhodium(I) acetate but from rhodium(I) thiolateadditional KOAc does not participate in transmetalation as a base
    • 2 without KOAc gave 3 a in 24 % yield (Supporting Information, Table S3, entry 5). This result implies that the acetate bound to the rhodium center was trapped as pinB-OAc after the transmetalation step (Scheme 2 A III, (X=OAc) + 4 a to IV), and thus, the acetate could no longer participate in the reaction. Therefore, we believe that the transmetalation occurs not from rhodium(I) acetate but from rhodium(I) thiolate, and additional KOAc does not participate in transmetalation as a base.
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    • P NMR analysis of the reaction mixture for the borylation of 2 a without addition of KOAc (Table 1, entry 8) after heating for 24 h at 80 °C showed a major doublet signal at, =8.3 ppm (, J, =108 Hz) as a single Rh-phosphine complex. Further study to characterize this species is currently underway
    • P-Rh=108 Hz) as a single Rh-phosphine complex. Further study to characterize this species is currently underway.
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.