28833-81-0Relevant articles and documents
Facile synthesis of indolizinoindolone, indolylepoxypyrrolooxazole, indolylpyrrolooxazolone and isoindolopyrazinoindolone heterocycles from indole and imide derivatives
Argade, Narshinha P.,Shelar, Santosh V.
, p. 6160 - 6169 (2021/07/21)
Chemo-, regio- and diastereoselective coupling reactions of indole with imide derivatives leading to unique heterocyclic systems are demonstrated. Acid-induced 3-position coupling reactions of indole with cyclic imide derived lactamols followed by acid promoted 2-position cyclizations with the corresponding aldehydes are described to obtain the indolizinoindolones and benzoindolizinoindolones. Base induced 2-position coupling reactions ofN-tosylindole withN-(2-iodoethyl)imides and the subsequent cyclizations provide indolylepoxypyrrolooxazole, indolylpyrrolooxazolone and indolyloxazoloisoindolone. Reductive cleavage of indolyloxazoloisoindolone to the corresponding alcohol followed by mesylation and base promotedN-cyclization affords thein situair-oxidized pentacyclic product hydroxyisoindolopyrazinoindolone. A regioisomeric structural revision of the natural product from 1,2,5,6,7,11c-hexahydro-3H-indolizino[7,8-b]indol-3-one to 1,2,5,6,11,11b-hexahydro-3H-indolizino(8,7-b)indol-3-one is also reported in the present studies focussed on the methodologies for heterocyclic synthesis.
DIASTEREOSELECTIVE ALKYLATION OF CHIRAL TIN(II) ENOLATES ONTO CYCLIC ACYL IMINIUM IONS. ASYMMETRIC TOTAL SYNTHESIS OF (-)-SUPINIDINE
Nagao, Yoshimitsu,Dai, Wei-Min,Ochiai, Masahito,Shiro, Motoo
, p. 6361 - 6380 (2007/10/02)
The scope and mechanism of the asymmetric alkylation of chiral tin(II) enolate 10 with cyclic acyl iminium ion 5 were investigated.An application of the reaction to the asymmetric synthesis of (-)-supinidine was also achieved.
NEW CHIRAL RECOGNITION OF CHIRAL TIN(II) ENOLATES TOWARD CYCLIC ACYL IMINIUM SPECIES. ASYMMETRIC TOTAL SYNTHESIS OF (-)-SUPINIDINE
Nagao, Yoshimitsu,Dai, Wei-Min,Ochiai, Masahito
, p. 6133 - 6136 (2007/10/02)
Diastereoselective alkylation of chiral tin(II) enolates 1 onto cyclic acyl iminium ion 7 proceeded in a different chiral recognition mode from the case of 1 onto cyclic acyl imines 3.This new diastereoselective alkylation was efficiently utilized for an asymmetric total synthesis of (-)-supinidine (20).