Direct Copper-Catalyzed C-H Monofluoroalkylation of Benzoxazoles with 1-Fluoro-1-haloalkanes
作者:Wei Li、Andrii Varenikov、Mark Gandelman
DOI:10.1002/ejoc.201901929
日期:2020.6.8
Copper‐catalyzed cross‐coupling reaction allowed the first directC–Hmonofluoroalkylation of benzoxazole with 1‐fluoro‐1‐haloalkanes, which bear β‐hydrogens and no directing groups in vicinity to the reaction center.
Preparation of α-bromoesters via the half esters of malonic acids a novel method for rapid decarboxylation under mild conditions
作者:O.P. Goel、U. Krolls
DOI:10.1016/s0040-4039(00)81355-6
日期:1983.1
α-Bromomalonic acid half esters were prepared in high yield and found to be rapidly decarboxylated to α-bromoesters under mild conditions using lithium carbonate in refluxing tetrahydrofuran.
New compounds of the formula
wherein:
Ar1 and Ar2 are each independently optionally substituted phenyl;
R', R2 and R3 are each independently hydrogen or alkyl;
a is an integer from 1-3;
b is an integer from 1-3;
c is an integer from 0-2; and
d is an integer from 0-2, such that (c + d) equals 0-2; and the pharmaceutically acceptable non-toxic acid addition salts thereof, are spermicidal and, therefore, are useful as contraceptives.
式中的新化合物
其中
Ar1 和 Ar2 各自独立地为任选取代的苯基;
R'、R2 和 R3 各自独立地为氢或烷基
a 是 1-3 的整数
b 是 1-3 的整数
c 是 0-2 的整数;以及
d 是 0-2 的整数,这样 (c + d) 等于 0-2;其药学上可接受的无毒酸加成盐具有杀精子作用,因此可用作避孕药。
Relative rates for the addition reactions of the malonyl radical to substituted styrenes induced by cerium(IV) ammonium nitrate and tributyltin hydride. A comparison