期刊
NATURAL PRODUCT COMMUNICATIONS
卷 17, 期 5, 页码 -出版社
SAGE PUBLICATIONS INC
DOI: 10.1177/1934578X221099141
关键词
entomopathogenic fungi; Cordyceps; cross-metathesis reaction; cordytakaoamide B; cordycepamide C; oxidative intramolecular lactone formation; ortho-tyrosinol
The ortho-tyrosinol derivative, a key synthetic intermediate for alkaloidal metabolites of Cordyceps, was synthesized from L-phenylalanine methyl ester through condensation with crotonic acid and oxidative intramolecular lactone formation. Subsequent elongation of the side chain involving a cross-metathesis reaction and deprotection resulted in the efficient synthesis of cordytakaoamide B and cordycepamide C in a few steps. The S-configurations at the C-2 position of both cordytakaoamide B and cordycepamide C were confirmed by comparing their optical rotation with synthetic samples.
The ortho-tyrosinol derivative, as a key synthetic intermediate for alkaloidal metabolites of Cordyceps, was synthesized from L-phenylalanine methyl ester via condensation with crotonic acid and oxidative intramolecular lactone formation by using phenyliodine(III) bis(trifluoroacetate). Subsequent elongation of the side chain involving a cross-metathesis reaction and deprotection yielded cordytakaoamide B and cordycepamide C in notably few synthetic steps. Furthermore, the S-configurations at the C-2 position of both cordytakaoamide B and cordycepamide C were confirmed by comparison with the sign of the optical rotation of the synthetic sample.
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