Synthesis of (S)-(−)- and (R)-(+)-O-methylbharatamine using a diastereoselective Pomeranz–Fritsch–Bobbitt methodology
摘要:
Laterally lithiated (S)-(-)- and (R)-(+)-o-toluamides 6 with a chiral auxiliary derived from (S)- and (R)-phenylalaninol, respectively, were used as the building blocks and chirality inductors in the asymmetric modification of the Pomeranz-Fritsch-Bobbitt synthesis of isoquinoline alkaloids. Their addition to imine 2 proceeded with partial cyclization, giving isoquinolones (+)-7 and (-)-7 along with acyclic products, (-)-8 and (+)-8, respectively. LAH-reduction of (+)-7 and (-)-7, followed by cyclization, afforded both enantiomers of the alkaloid, (S)-(-)- and (R)-(+)-O-methylbharatamine 5, in 32% and 40% overall yield and with 88% and 73% ees, respectively. (c) 2005 Elsevier Ltd. All rights reserved.
The asymmetric synthesis of (R)-(+)- and (S)-(−)-O-methylbharatamine
作者:Maria Chrzanowska、Agnieszka Dreas
DOI:10.1016/j.tetasy.2004.06.038
日期:2004.8
The asymmetric syntheses of (R)-(+)- and (S)-(−)-O-methylbharatamine were performed using the lateral metallation strategy, in which (R)- and (S)-phenylalaninol were applied as chiral auxiliaries. The addition reaction of chiral o-toluamide carbanion to 6,7-dimethoxy-3,4-dihydroisoquinoline proceeded with a simultaneous cyclization reaction, giving both enantiomers of 2,3-dimethoxy-8-oxoberbine in
Synthesis of (S)-(−)- and (R)-(+)-O-methylbharatamine using a diastereoselective Pomeranz–Fritsch–Bobbitt methodology
作者:Maria Chrzanowska、Agnieszka Dreas、Maria D. Rozwadowska
DOI:10.1016/j.tetasy.2005.07.025
日期:2005.9
Laterally lithiated (S)-(-)- and (R)-(+)-o-toluamides 6 with a chiral auxiliary derived from (S)- and (R)-phenylalaninol, respectively, were used as the building blocks and chirality inductors in the asymmetric modification of the Pomeranz-Fritsch-Bobbitt synthesis of isoquinoline alkaloids. Their addition to imine 2 proceeded with partial cyclization, giving isoquinolones (+)-7 and (-)-7 along with acyclic products, (-)-8 and (+)-8, respectively. LAH-reduction of (+)-7 and (-)-7, followed by cyclization, afforded both enantiomers of the alkaloid, (S)-(-)- and (R)-(+)-O-methylbharatamine 5, in 32% and 40% overall yield and with 88% and 73% ees, respectively. (c) 2005 Elsevier Ltd. All rights reserved.