N -2,4-二甲基-6-碘苯基-N-烯丙基苯胺的标准Boc,Alloc和Cbz衍生物在轴向上是手性的,可以容易地拆分为消旋势垒超过30 kcal / mol的阻转异构体。拆分后的轴向手性氨基甲酸酯会经历自由基和阴离子环化反应,并且在取代的二氢吲哚产物中会从N-Ar轴向新的立体中心高水平的手性转移。产品的氨基甲酸酯基团很容易除去。
Electrochemical Conjugate Additions of the Allyl Groups in Substituted Allyl Halides to α,β-Unsaturated Esters
作者:Shohei Satoh、Hiroshi Suginome、Masao Tokuda
DOI:10.1246/bcsj.54.3456
日期:1981.11
2 M† tetraethylammonium tosylate gave a conjugateaddition product, ethyl 3-(ethoxycarbonyl)-5-hexenoate, in a moderate yield. The electrochemical reaction of 1-chloro-3-methyl-2-butene (4) with 2, that of allyl chloride 4 with methyl crotonate (6), and that of methyl 4-halo-2-butenoate with 2 likewise gave the corresponding conjugateaddition products, ethyl 3-(ethoxycarbonyl)-6-methyl-5-heptenoate
and useful synthons for the synthesis of Famvir®, an antiviral drug. Simple methods for the preparation of 2-haloalkylidenemalonates are not available. We have developed a novel and non-cumbersome methodology for the synthesis of dialkyl 2-(2-haloethylidene)malonates, cyanoacetates and halocrotonates by one carbon extension of dialkyl (2-alkoxymethylene)malonates, cyanoacetates and 3-alkoxyacrylates with
Asymmetric Radical and Anionic Cyclizations of Axially Chiral Carbamates
作者:David B. Guthrie、Dennis P. Curran
DOI:10.1021/ol802616u
日期:2009.1.1
Cbz derivatives of N-2,4-dimethyl-6-iodophenyl-N-allyl anilines are axiallychiral and can be readily resolved into atropisomers whose racemization barriers exceed 30 kcal/mol. The resolved axiallychiral carbamates undergo radical and anionic cyclizations with high levels of chiralitytransfer from the N−Ar axis to the new stereocenter in the substituted dihydroindole products. The carbamate groups of
N -2,4-二甲基-6-碘苯基-N-烯丙基苯胺的标准Boc,Alloc和Cbz衍生物在轴向上是手性的,可以容易地拆分为消旋势垒超过30 kcal / mol的阻转异构体。拆分后的轴向手性氨基甲酸酯会经历自由基和阴离子环化反应,并且在取代的二氢吲哚产物中会从N-Ar轴向新的立体中心高水平的手性转移。产品的氨基甲酸酯基团很容易除去。
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