The favorskii rearrangement of dichlorinated methylketones
作者:N. Schamp、N. De Kimpe、W. Coppens
DOI:10.1016/0040-4020(75)80198-0
日期:1975.1
Twenty-two dichlorinated methylketones have been submitted to Favorskiirearrangement in NaOMeMeOH. Distribution of products is strongly dependent on substitution. Primary dichloromethyl-ketones (R2 = H) gave rise to Favorskii esters only. Results are explained by a cyclopropanone intermediate, which is formed stereospecifically by disrotative closure of a delocalized zwitter-ion. Opening of the cyclopropanone
The present invention provides novel antifibrinilytic compounds, processes for their preparation, pharmaceutical and veterinary compositions thereof, and their use in medicine, in particular for the treatment of bleeding.
US4837357A
申请人:——
公开号:US4837357A
公开(公告)日:1989-06-06
Cu-Catalyzed Alkynylation of Unactivated C(sp<sup>3</sup>)–X Bonds with Terminal Alkynes through Directing Strategy
作者:Fei-Xian Luo、Xing Xu、Ding Wang、Zhi-Chao Cao、Yun-Fei Zhang、Zhang-Jie Shi
DOI:10.1021/acs.orglett.6b00289
日期:2016.5.6
and concise protocol for Cu-catalyzed cross-coupling of unactivated alkyl halides/peusudohalides with terminal alkynes to afford internal alkynes with the assistance of various amides as directing groups. Different alkyl halides/pseudohalides exhibited excellent reactivities, and the inactivated alkyl chlorides and sulfonates showed better reactivity than bromides/iodides. This is the first successful