A m -C 2 B 10 H 11 HgCl/AgOTf-catalyzed reaction of allyl silyl ethers with N -Boc- N ′-tosylhydrazine has been developed. Under mild conditions, the resulting allyl hydrazine products were transformed into naked alkenes in good yield. Furthermore, the used m -C 2 B 10 H 11 HgCl could be recovered quantitatively.
已开发出 m -C 2 B 10 H 11 HgCl/AgOTf 催化的烯丙基甲硅烷基醚与 N -Boc-N '-甲苯磺酰肼的反应。在温和的条件下,所得的烯丙基肼产物以良好的收率转化为裸烯烃。此外,使用过的m -C 2 B 10 H 11 HgCl 可以定量回收。
Iodine-Catalyzed Regioselective Sulfenylation of Indoles with Sulfonyl Hydrazides
作者:Fu-Lai Yang、Shi-Kai Tian
DOI:10.1002/anie.201301437
日期:2013.4.26
New S in town: Sulfonylhydrazides smoothly undergo sulfenylation with indoles in the presence of 10 mol % I2 to give structurally diverse indole thioethers in moderate to excellent yields with extremely high regioselectivity. This study paves the way for the use of sulfonylhydrazides as unique sulfur electrophiles in chemical synthesis.
The traditional McFadyen–Stevensreaction requires harsh alkaline reaction conditions, thus precluding application to the synthesis of aliphatic aldehydes. Our modified McFadyen–Stevensreaction enables the transformation from the N,N-acylsulfonyl hydrazine to the corresponding aldehyde upon treatment with an imidazole–TMS imidazole combination without relying on oxidative or reductive reagents. The
Regio- and Stereocontrolled Synthesis of 3-Substituted 1,2-Diazetidines by Asymmetric Allylic Amination of Vinyl Epoxide
作者:Sundaram Rajkumar、Guy J. Clarkson、Michael Shipman
DOI:10.1021/acs.orglett.7b00653
日期:2017.4.21
Pd-catalyzed asymmetric allylic amination of rac-vinyl epoxide with unsymmetrical 1,2-hydrazines proceeds with excellent regio- and stereocontrol, which after further ring closure provides differentially protected 3-vinyl-1,2-diazetidines in good yields. The chirality at C-3 exerts stereocontrol over the nitrogen centers in the 1,2-diazetidine with all substituents orientating themselves trans to their
On the regiochemistry of Mitsunobu alkylations of hydrazine derivatives
作者:Damian G. Dunford、Faryal Chaudhry、Benson Kariuki、David W. Knight、Robert C. Wheeler
DOI:10.1016/j.tetlet.2012.10.084
日期:2012.12
That differentially protected hydrazines of the type TsNHNHCOR3 undergo regiospecific Mitsunobu reactions with a variety of alcohols, R1R2CHOH in a generalised manner, to give good to excellent yields of the mono-adducts Ts(R1R2CH)NNHCOR3, has been proven by X-ray crystallographic analysis.
TsNHNHCOR 3类型的受不同保护的肼与多种醇R 1 R 2 CHOH以广义方式进行区域特异性的Mitsunobu反应,以使单加合物Ts(R 1 R 2 CH)NNHCOR 3的收率达到良好至极佳的水平,已通过X射线晶体学分析证明。