Diastereoselective Synthesis of Functionalized Tetrahydrocarbazoles via a Domino-Ring Opening–Cyclization of Donor–Acceptor Cyclopropanes with Substituted 2-Vinylindoles
作者:Ranadeep Talukdar、Deo Prakash Tiwari、Amrita Saha、Manas K. Ghorai
DOI:10.1021/ol501763n
日期:2014.8.1
synthetic approach for the synthesis of highly functionalized tetrahydrocarbazoles via DROC of various functionalized DA-cyclopropanes with 2-indolylnitroethylene and indole-substituted alkylidene malonate is described. The tetrahydrocarbazoles were obtained with excellent diastereoselectivity having cis alignment of the 1,4-appendages across the six-memberedcarbocyclic ring.
A Route to Highly Functionalized β-Enaminoesters via a Domino Ring-Opening Cyclization/Decarboxylative Tautomerization Sequence of Donor–Acceptor Cyclopropanes with Substituted Malononitriles
作者:Manas K. Ghorai、Ranadeep Talukdar、Deo Prakash Tiwari
DOI:10.1021/ol5007218
日期:2014.4.18
An unprecedented and domino synthetic strategy for the synthesis of highly functionalized carbocyclic beta-enaminoesters bearing an all-carbon quaternary center via Yb(OTf)(3)-catalyzed ring-opening cyclization/decarboxylative tautomerization of donor acceptor cyclopropanes with 2-alkyl malononitriles in excellent yields is described: The products are obtained as a single diastereomer in most cases where the nitrile and aryl groups are aligning in a cis orientation across the ring.
(3 + 3)-Cyclodimerization of Donor–Acceptor Cyclopropanes. Three Routes to Six-Membered Rings
作者:Olga A. Ivanova、Ekaterina M. Budynina、Alexey O. Chagarovskiy、Igor V. Trushkov、Mikhail Ya. Melnikov
DOI:10.1021/jo201612w
日期:2011.11.4
The ability of donor acceptor cyclopropanes to (3 + 3)-cyclodimerize is disclosed. It has been found that Lewis acid-induced transformations of 2-(hetero)arylcyclopropane-1,1-dicarboxylates containing electron-abundant aromatic substituents led to the construction of six-membered cyclic systems. Depending on the substrate properties and the Lewis acid applied, three types of products can be obtained: (1) 1,4-diarylcyclohexanes, (2) 1-aryl-1,2,3,4-tetrahydronaphthalenes, and (3) 9,10-dihydroanthracenes.
KATAKAWA, JUNICHI;YOSHIMATSU, HIDEAKI;YOSHIDA, MORIHIRO;ZHANG, YONG;IRIE,+, CHEM. AND PHARM. BULL., 36,(1988) N 10, C. 3928-3932