A new route to 9,9a-Dihydro-3H-pyrrolo[1,2-a]indoles via radical cyclization
作者:Frederick E. Ziegler、Lucio O. Jeroncic
DOI:10.1021/jo00011a008
日期:1991.5
A new method for the preparation of 9,9a-dihydro-3H-pyrrolo[1,2-a]indoles, an important substructure for the synthesis of mitomycins, is presented. A number of representative indoles are allylated on nitrogen with 1,3-dihalopropenes followed by n-Bu3SnH-mediated radical cyclization. The effect of the substitution patterns of the indoles and reaction conditions is explored. In all reactions the products of cyclization predominate; however, uncyclized materials are produced along with isomers and oxidation products of the cyclized substances.
ZIEGLER, FREDERICK E.;JERONCIC, LUCIO O., J. ORG. CHEM., 56,(1991) N1, C. 3479-3486
作者:ZIEGLER, FREDERICK E.、JERONCIC, LUCIO O.
DOI:——
日期:——
Kinetic isotope effects in the intramolecular insertion of a metal carbene into a CH bond adjacent to nitrogen
作者:Gary A. Sulikowski、Sangku Lee
DOI:10.1016/s0040-4039(99)01686-x
日期:1999.11
An internal competition was used to estimate the kineticisotope effect of an intramolecular metal carbene CH insertion reaction alpha to a nitrogen atom. A stereoelectronic effect is proposed to explain the difference in magnitude of the observed KIEs for cis and trans diastereomers.