A facile asymmetric synthesis of Δ3-2-Hydroxybakuchiol, Bakuchiol and ent-Bakuchiol
作者:Qian-Qian Xu、Qun Zhao、Guang-Sheng Shan、Xi-Cheng Yang、Qi-Yuan Shi、Xinsheng Lei
DOI:10.1016/j.tet.2013.10.064
日期:2013.12
A facile asymmetric synthesis of Delta(3)-2-Hydroxybakuchiol, Bakuchiol, and ent-Bakuchiol is described through one common intermediate bearing a chiral all-carbon quaternary carbon center, which involves stereoselectively unconjugated alkylation of the alpha,beta-unsaturated imide bearing Evans' auxiliary, Takai-Utimoto reaction, Negishi reaction, and Heck reaction as key steps. (C) 2013 Elsevier Ltd. All rights reserved.
277. Organic fluorine compounds. Part X. Reaction of organic compounds with iodine in the presence of silver fluoride or trifluoroacetate
作者:Ernst D. Bergmann、Israel Shahak
DOI:10.1039/jr9590001418
日期:——
Antifungal activity of 4-substituted crotonic acid esters
作者:Herman Gershon、Larry Shanks、Daniel E. Gawiak
DOI:10.1021/jm00230a019
日期:1976.8
Twenty-three 4-substituted crotonicacid esters were tested for antifungal activity against Candida albicans, Aspergillus niger, Mucor mucedo, and Trichophyton mentagrophytes. For the analogues of the methyl ester containing substituents in the 4 position, the following order of fungitoxicity was observed: I greater than Br greater than Cl greater than CH3S greater than CH3O greater than F=H. Of the
The first intramolecular doubly vinylogous Michael addition (DVMA) has been revealed for the construction of 2-alkenyl benzofuran and 2-alkenyl indole derivatives.