Hydrogenation was only the beginning: Hantzsch esters have now been used to transferalkyl groups to imines under mild catalytic conditions to provide a variety of amines (see scheme). Benzyl, secondary alkyl, and tertiary alkyl groups containing ether, ester, and hydroxy functionalities were transferred successfully. The use of Hantzsch esters as alkylation reagents offers a practical and complementary
By employing a chiral Lewis base as the catalyst, enantioselective hydrosilylation of N-(1,2-diarylethylidene)arylamines was realized. The reactions proceeded smoothly to afford various chiral 1,2-diarylethanamines with good yields (up to 99%) in good enantioselectivities (up to 98%). Furthermore, one of the products was employed in the synthesis of a pharmaceutical substance.
Regioselective Domino Metathesis of Unsymmetrical 7-Oxanorbornenes with Electron-Rich Vinyl Acetate toward Biologically Active Glutamate Analogues
作者:Masato Oikawa、Minoru Ikoma、Makoto Sasaki、Martin B. Gill、Geoffrey T. Swanson、Keiko Shimamoto、Ryuichi Sakai
DOI:10.1002/ejoc.200900580
日期:2009.11
In this article a regioselectivedominometathesis reaction of unsymmetrical7-oxanorbornenes, readily available by a tandem Ugi/Diels-Alder reaction as a key step, promoted by the Hoveyda-Grubbs second-generation catalyst in the presence of electron-richvinylacetate as a cross metathesis (CM) substrate is reported. The mechanism for the unusually high regioselectivity observed in the CM reaction