Radical borylation of vinyl azides with NHC-boranes: divergent synthesis of α-boryl ketones and borylated triazoles
作者:Yifei Zhang、Yangzhen Liao、Peijun Liu、Yu Ran、Xiaozu Liu
DOI:10.1039/d2ob00076h
日期:——
A divergent radical borylation of vinyl azides with N-heterocyclic carbene (NHC) boranes in the presence of tBuSH is described. The protocol enables the divergent synthesis of α-boryl ketones and borylated triazoles with excellent functional group tolerance and a broad substrate scope. Remarkably, this work shows that vinyl azides can serve as unprecedented five-atom synthons for the construction of
描述了在t BuSH存在下,乙烯基叠氮化物与 N-杂环卡宾 (NHC) 硼烷的发散自由基硼化反应。该协议能够实现α-硼基酮和硼化三唑的不同合成,具有优异的官能团耐受性和广泛的底物范围。值得注意的是,这项工作表明乙烯基叠氮化物可以作为前所未有的五原子合成子用于构建 1,2,3-三唑,而无需 N 2挤出。
Boron estrogens: Synthesis, biochemical and biological testing of estrone and estradiol-17β 3-carboranylmethyl ethers
作者:Frederick Sweet
DOI:10.1016/s0039-128x(81)80020-7
日期:1981.2
Synthesis, biochemical and biological testing of the first carborane derivatives of estrogens are described. Estrone 3-carboranylmethyl ether was synthesized in two steps from estrone. Reduction of estrone 3-carboranylmethyl ether with sodium borohydride provided estradiol-17 beta 3-carboranylmethyl ether. Enzyme kinetic measurements showed that estrone 3-carboranylmethyl ether is a substrate for human placental 17 beta-hydroxysteroid dehydrogenase with Km = 5 x 10(-6)M, and Vmax = 0.016 mumol min-1 microgram -1. The relative affinity constant of estradiol-17 beta 3-carboranylmethyl ether for rat uterine estrogen receptor was 0.5 (compared with a value of 100 for estradiol-17 beta). Consistent with its low affinity for estrogen receptor, the dose-dependent uterotropic response to estradiol-17 beta 3-carboranylmethyl ether in castrated female rats was one sixtieth that of estradiol-17 beta. None of the tested rats had a toxic reaction to estradiol-17 beta 3-carboranylmethyl ether. These results demonstrate that exceptionally stable carborane derivatives of estrogens can be synthesized with preservation of their biochemical and biological properties. Boron-containing estrogens may be useful for thermal neutron capture therapy of cancers with estrogen receptors to concentrate boron in the cell nucleus.