Telluronium Salts Mediated Aziridination of Chiral <i>N</i>-<i>tert</i>-Butylsulfinylimines: Highly Stereoselective Synthesis of Optically Active Vinylaziridines
作者:Jun-Cheng Zheng、Wei-Wei Liao、Xiao-Xia Sun、Xiu-Li Sun、Yong Tang、Li-Xin Dai、Jin-Geng Deng
DOI:10.1021/ol051921n
日期:2005.12.1
[reaction: see text] Optically active cis-2-substituted vinylaziridines are synthesized by the reaction of N-tert-butylsulfinylimines with telluroniumylides with excellent diastereoselectivity in good to excellent yields.
Diastereoselective Cyanomethylation of Chiral<i>N</i>-(<i>tert</i>-Butylsulfinyl)imines Promoted by Lewis Bases
作者:Teruaki Mukaiyama、Makoto Michida
DOI:10.1246/cl.2007.1244
日期:2007.10.5
Cyanomethylation of chiral N-(tert-butylsulfinyl)imines with 2-trimethylsilylacetonitrile (TMSCH2CN) in the presence of a Lewis base such as tetrabutylammonium phenoxide (PhONn-Bu4) proceeds smoothly to afford the corresponding β-amino nitriles in good to high yields with excellent diastereoselectivities.
intramolecular hydroarylation of allyl aryl ethers was realized by palladium‐catalyzed reductive heck reactions utilizing a newchiral sulfinamide phosphine ligand (N‐Me‐XuPhos). N‐Me‐XuPhos can be easily prepared on gram scale from readily available starting materials in a one‐potsynthesis approach. A series of optically active 2,3‐dihydrobenzofurans bearing a quaternary stereocenter were obtained in good
烯丙基芳基醚的高对映选择性分子内氢芳基化反应的第一个例子是通过使用新的手性亚磺酰胺膦配体(N- Me - XuPhos)进行钯催化的还原性heck反应而实现的。N- Me - XuPhos可以通过一锅合成方法轻松地从容易获得的起始原料中以克为单位制备。以良好的收率和优异的对映选择性获得了一系列带有季立体中心的旋光2,3-二氢苯并呋喃。该反应的实用性已在CB2受体激动剂的直接合成中得到验证。此外,将氘有效地掺入了产品中。
Stereoselective Synthesis of α-Silylamines by the Direct Addition of Silyl Anions to Activated Imines
作者:David M. Ballweg、Rebecca C. Miller、Danielle L. Gray、Karl A. Scheidt
DOI:10.1021/ol050244u
日期:2005.3.1
A highly efficient stereoselective synthesis of unusual alpha-silylamines via a direct silyl anion addition reaction is reported. This approach is convergent and avoids any problematic aza-Brook shifts of the anionic intermediates. The use of enantiopure tert-butanesulfinyl imines as the electrophiles affords exceedingly high levels of diastereocontrol for the newly formed stereogenic carbon.
Three-Component Reactions of Sulfonylimidates, Silyl Glyoxylates and <i>N</i>-<i>tert</i>-Butanesulfinyl Aldimines: An Efficient, Diastereoselective, and Enantioselective Synthesis of Cyclic <i>N</i>-Sulfonylamidines
作者:Ming Yao、Chong-Dao Lu
DOI:10.1021/ol201029b
日期:2011.5.20
Three-component coupling reactions of sulfonylimidates, silyl glyoxylates and N-tert-butanesulfinyl aldimines efficiently provide cyclic N-sulfonylamiclines containing free endocyclic N-H. The formation of two C-C bonds (contiguous stereogenic carbons), one O-Si bond, and one C-N bond, together with the cleavage of the chiral auxiliary (tert-butanesulfinyl group), occurs with excellent chemoselectivity, diastereoselectivity, and enantioselectivity in this one-pot cascade transformation.