Practical preparation of N-(1-alkynyl)sulfonamides and their synthetic utility in titanium alkoxide-mediated coupling reactions
作者:Shuji Hirano、Yasuhiro Fukudome、Ryoichi Tanaka、Fumie Sato、Hirokazu Urabe
DOI:10.1016/j.tet.2005.11.080
日期:2006.4
olefinic stereo-, and diastereoselective addition to aldehydes to give virtually single allyl alcohols. Alternatively, inter- or intramolecular coupling reaction between N-(1-alkynyl)sulfonamides and another acetylene or olefin with the above titanium alkoxide reagent generated the corresponding titanacycles, hydrolysis of which furnished stereo-defined (sulfonylamino)dienes or cyclic compounds.
在CuI的催化存在下,将脂肪族和芳香族磺酰胺用1-溴-1-炔烃炔化,从而以良好或优异的收率得到N-(1-炔基)磺酰胺。在该炔基化过程中未观察到旋光磺酰胺的外消旋作用。从所得产生的乙炔钛络合物ñ - (1-炔基)磺酰胺和Ti(O-我-Pr)4 /2我-PrMgCl后行区域选择性,立体-烯烃,和非对映选择性加成到醛,得到几乎单一烯丙基酒精。或者,N之间的分子间或分子内偶联反应-(1-炔基)磺酰胺和另一种乙炔或烯烃与上述烷氧基钛试剂产生相应的钛环,其水解得到立体确定的(磺酰基氨基)二烯或环状化合物。