Three-carbon annelations. Regiocontrolled reactivity of trimethylsilyl- and ethoxyethyl-protected cyanohydrins. Versatile homoenolate and acyl anion equivalents
1,2,3,4-二环氧丁烷 (DEB) 被认为是 1,3-丁二烯的最终致癌代谢物,1,3-丁二烯是城市空气中存在的一种重要的工业化学品和环境污染物。虽然它优先修饰 DNA 中的鸟嘌呤,但 DEB 会诱导大量 A → T 颠换,表明它在腺嘌呤核碱基处形成强烈的错配损伤。我们现在报告了 DEB 的三个潜在错配环外腺嘌呤病变的发现:N 6 , N 6 -(2,3-dihydroxybutan-1,4-diyl)-2'-deoxyadenosine (compound 2 ), 1, N 6 -( 2-hydroxy-3-hydroxymethylpropan-1,3-diyl)-2'-deoxyadenosine (compound 3 ), and 1, N 6-(1-羟甲基-2-羟基丙烷-1,3-二基)-2'-脱氧腺苷(化合物4 )。新型 DEB-dA 加合物的结构和立体化学由紫外和核磁共振
A new synthesis of dl-5-vinyloxazolidine-2-thione, a natural antithyroid factor
作者:C. Gardrat、L. Latxague、J. P. Picard
DOI:10.1002/jhet.5570270361
日期:1990.3
A new procedure for the preparation of DL-5-vinyloxazolidine-2-thione (goitrin) 3 via a facile and practical synthesis of the key intermediate DL-1-amino-3-buten-2-ol 2 is described.
metal-catalyzed hydroalkynylation reactions are efficient transformations allowing the straightforward formation of functionalized alkynes. Therein, we disclose the cobalt-catalyzed hydroalkynylation of vinylaziridines giving rise to both linear and branched enynes. The optimization of the reaction conditions allowed to determine the key parameters of the cobalt-based catalytic system. The scope investigation
Scope of the directed dihydroxylation: application to cyclic homoallylic alcohols and trihaloacetamides
作者:Timothy J. Donohoe、Lee Mitchell、Michael J. Waring、Madeleine Helliwell、Andrew Bell、Nicholas J. Newcombe
DOI:10.1039/b303081d
日期:——
The synthesis and directed dihydroxylation of a range of cyclic alkenes was investigated. Both homoallylic alcohols and homoallylic trihaloacetamides were found to be efficient directing groups, giving rise to good to excellent levels of remote asymmetric induction with OsO4–TMEDA. Interestingly, in all cases examined, trifluoroacetamides were found to be superior to trichloroacetamides as directing groups and an argument is presented which rationalises this observation.