Direct alkenylation of arylamines at the ortho-position with magnesium alkylidene carbenoids and some theoretical studies of the reactions
作者:Tsuyoshi Satoh、Yumi Ogino、Kaori Ando
DOI:10.1016/j.tet.2005.08.035
日期:2005.10
1-Chlorovinyl p-tolyl sulfoxides were synthesized from ketones and chloromethyl p-tolyl sulfoxide in high yields. Treatment of the sulfoxides with isopropylmagnesium chloride at −78 °C in toluene gave magnesium alkylidene carbenoids (α-chloro alkenylmagnesium chlorides), which were treated with N-lithio arylamines to afford ortho-alkenylated arylamines in moderate yields. The reaction, in some cases, proceeded
Direct alkenylation of arylamines at the ortho-position
作者:Tsuyoshi Satoh、Yumi Ogino、Masatomo Nakamura
DOI:10.1016/j.tetlet.2004.06.024
日期:2004.7
gave ortho-alkenylated arylamines in moderate to good yields. The reaction was found to proceed in a highly stereospecific manner at the carbenoid carbon. This reaction offers a quite novel and directalkenylation of arylamines at the ortho-position of the aromatic ring.
Herein, an unprecedented non-noble-metal-catalyzed oxidation/cyclization of ene-ynamides is developed, allowing the synthesis of diversely functionalized lactams in moderate to good yields with excellent diastereoselectivities without the observation of typical cyclopropanation products. In combination with Ellman’s tert-butylsulfinimine chemistry, chiral γ-lactams containing three contiguous stereocenters