Total Synthesis of Enantiopure Potassium Aeshynomate
摘要:
Potassium aeshynomate (1) is the leaf-opening factor of the nyctinastic plant Aeshynomene indica L. In this article a convenient and efficient strategy for the total synthesis of enantiomerically pure 1 is described, starting from the L-arabinose derived chiron ent-6. The realized synthetic scheme involves a postcoupling oxidation approach and securely determines the absolute configuration of the targeted natural product, which remained unknown until now.
Total synthesis of neolignans, americanin A and isoamericanin A.
作者:HITOSHI TANAKA、ICHIRO KATO、KAZUO ITO
DOI:10.1248/cpb.35.3603
日期:——
The condensation reaction of 3-benzyloxy-4-hydroxybenzaldehyde with 2, 3-epoxy-3- [(3, 4-dimethoxymethoxy) phenyl] -1-propanol, prepared from caffeic acid in four steps, afforded the ether (11) in good yield. Mesylation of 11 followed by treatment with potassium carbonate, provided the epoxide (13), which was converted to the debenzylation product (14) by hydrogenolysis. Compound 14 underwent cyclization with potassium carbonate to yield the trans dioxane derivative (15). Reaction of 15 with the ylide (16) followed by hydrolysis furnished americanin A (1). Isoamericanin A (3) was similarly synthesized from another condensation product (18).
Abstract The firsttotalsynthesis of (4E,6E)-1,7-bis(3,4-dihydroxyphenyl)-hepta-4,6-dien-3-one and an alternative synthesis of (4E,6E)-1,7-bis(4-hydroxyphenyl)-hepta-4,6-dien-3-one, two natural diarylheptanoids, mainly based on Claisen–Schmidt condensation were described. The crucial steps of the syntheses were the condensation of OH-protected 4-aryl-2-butanones with OH-protected 3-aryl-acrylaldehydes
Enantioselective synthesis of (2 R ,3 S )-(+)-catechin
作者:Sang-sup Jew、Doo-yeon Lim、So-young Bae、Hyun-ah Kim、Jeong-hoon Kim、Jihye Lee、Hyeung-geun Park
DOI:10.1016/s0957-4166(02)00182-9
日期:2002.5
A new enantioselective synthetic method for catechin from trans-methyl cinnamate derivative was developed via asymmetric dihydroxylation (ADH), the addition of an aryllithium species, followed by the Barton-McCombie reaction and all intramolecular Mitsunobu reaction as key steps. (C) 2002 Elsevier Science Ltd. All rights reserved.
Tetrahedron 2015, 71, 3120-3130
作者:
DOI:——
日期:——
TANAKA, HITOSHI;KATO, ICHIRO;ITO, KAZUO, CHEM. AND PHARM. BULL., 35,(1987) N 9, 3603-3608