Expanding Stereoelectronic Limits of <i>endo</i>-<i>tet</i> Cyclizations: Synthesis of Benz[<i>b</i>]azepines from Donor–Acceptor Cyclopropanes
作者:Anna E. Vartanova、Andrey Yu. Plodukhin、Nina K. Ratmanova、Ivan A. Andreev、Mikhail N. Anisimov、Nikita B. Gudimchuk、Victor B. Rybakov、Irina I. Levina、Olga A. Ivanova、Igor V. Trushkov、Igor V. Alabugin
DOI:10.1021/jacs.1c07088
日期:2021.9.1
N-alkyl-N-arylcarbamoyl moiety as an acceptor group undergo Lewis acid-induced cyclization to form tetrahydrobenz[b]azepin-2-ones in high yields. The reaction proceeds with the inversion of the configuration at the electrophilic carbon. In this process, a formally six-membered transition state yields a seven-membered ring as the pre-existing cycle is merged into the forming ring. The stereochemistry of the products
A general intramolecular Friedel–Crafts approach to functionalized pyrrolo[3,2,1-ij]quinolin-4-ones
作者:Dadasaheb V. Patil、Marchello A. Cavitt、Paul Grzybowski、Stefan France
DOI:10.1039/c2cc34650h
日期:——
An indium(III)-catalyzed intramolecular FriedelâCrafts annulation for the efficient synthesis of pyrrolo[3,2,1-ij]quinolin-4-ones is described. The products are formed in good to excellent yields (51â97%) with diastereoselectivities up to >99â:â1 dr.