A superior synthesis of [6,6]-methanofullerenes: The reaction of sulfonium ylides with C60
作者:Yihan Wang、Jingrong Cao、David I. Schuster、Stephen R. Wilson
DOI:10.1016/0040-4039(95)01443-l
日期:1995.9
The addition-elimination reaction of stabilized sulfoniumylides 1a–f to C60 provides a new high yield route to [6,6]-methanofullerenes. The rates of reaction differ with the nucleophilicity of the ylides.
The first example of iron‐catalyzed decarboxylative (4+1) cycloaddition reactions is described in this publication. By using this method, a wide range of functionalized indoline products were prepared from easily available vinyl benzoxazinanones and sulfur ylides in high yields and selectivities. A possible reaction pathway involving an allylic iron intermediate is discussed based on a series of control
Formal [4 + 1] cycloaddition of o-quinone methides: facile synthesis of dihydrobenzofurans
作者:Xiantao Lei、Chun-Huan Jiang、Xiaoan Wen、Qing-Long Xu、Hongbin Sun
DOI:10.1039/c4ra17003b
日期:——
An efficient and straightforward method for the rapid synthesis of 2-substituted dihydrobenzofurans has been developed via reaction of sulfur ylides with o-quinonemethides (o-QMs), which were generated under mild conditions. The products could be obtained in excellent yields with various kinds of sulfur ylides.
Catalytic Asymmetric Synthesis of Chiral Dihydrobenzofurans through a Formal [4+1] Annulation Reaction of Sulfur Ylides and In Situ Generated<i>ortho</i>-Quinone Methides
作者:Qing-Qing Yang、Wen-Jing Xiao
DOI:10.1002/ejoc.201601186
日期:2017.1.10
The first example of a catalytic asymmetric formal [4+1] annulation reaction between sulfur ylides and in situ generated ortho-quinone methides (o-QMs) is reported in this work. A C2-symmetric chiral urea was identified to be the best H-bonding catalyst, affording a wide range of chiral 2,3-dihydrobenzofurans in high yields and moderate enantioselectivities [70–98 % yields, up to 89:11 e.r. (enantiomeric
在这项工作中报道了硫叶立德与原位生成的邻醌甲基化物 (o-QMs) 之间的催化不对称形式 [4+1] 环化反应的第一个例子。一种 C2 对称手性尿素被认为是最好的 H 键合催化剂,可提供范围广泛的手性 2,3-二氢苯并呋喃,收率高,对映选择性适中 [70–98% 收率,高达 89:11 er )]。
(E)-β,γ-unsaturated amides from (E)-9-alkenyl-9-borabicyclo[3.3.1]nonane and N,N-dialkyl(dimethylsulfuranylidene)acetamide
作者:Min-Zhi Deng、Nan-Sheng Li、Yao-Zeng Huang
DOI:10.1039/c39930000065
日期:——
A facile route for the stereocontrolled synthesis of (E)-β,γ-unsaturated amides by the reaction of stereodefined 9-alkenyl-9-borabicyclo[3.3.1]nonane with N,N-dialkyl(dimethylsulfuranylidene)acetamide is described.