Synthesis of Seven-membered Lactones via Nickel- and Zinc-Catalyzed Highly Regio- and Stereoselective Cyclization of 2-Iodobenzyl Alcohols with Propiolates
作者:Dinesh Kumar Rayabarapu、Chien-Hong Cheng
DOI:10.1021/ja017390p
日期:2002.5.1
class of substituted seven-membered lactones 3 were conveniently synthesized viacyclization of o-iodobenzyl alcohol 1 (o-IC(6)H(4)CH(2)OH) with various propiolates 2 (RC triple bond CCOOMe) in the presence of Ni(dppe)Br(2) and Zn powder in acetonitrile at 80 degrees C. The catalytic reaction is highly regio- and stereoselective affording seven-membered lactones in moderate to good yields. This methodology
Molybdenum(0)-Promoted Carbonylative Cyclization of<i>o</i>-Haloaryl- and β-Haloalkenylimine Derivatives by Oxidative Addition of a Carbon(sp<sup>2</sup>)Halogen Bond: Preparation of Two Types of γ-Lactams
作者:Jun Takaya、Kenichiro Sangu、Nobuharu Iwasawa
DOI:10.1002/anie.200902884
日期:2009.9.7
Lovely lactams: Synthetically useful γ‐lactam derivatives have been prepared through the unique title transformation. By utilizing the characteristic property of the molybdenum complex, two kinds of products (both of which have rarely been obtained by reactions catalyzed by late transition metals) were obtained selectively by adjusting the reaction conditions (see scheme).