Enantiomerically pure α-methoxyaryl acetaldehydes as versatile precursors: a facile chemo-enzymatic methodology for their preparation
摘要:
A facile and efficient synthesis of optically active alpha-methoxyaryl acetic acids (up to 95% ee), alpha-methoxyaryl ethanols (up to 93% ee) and alpha-methoxyaryl acetonitriles (up to 93% ee) was achieved via Arthrobacter sp. lipase-catalyzed kinetic resolution of masked aldehydes as the key synthons, that is, alpha-hydroxyaryl acetaldehyde acetals. (C) 2008 Elsevier Ltd. All rights reserved.
Enantiomerically pure α-methoxyaryl acetaldehydes as versatile precursors: a facile chemo-enzymatic methodology for their preparation
摘要:
A facile and efficient synthesis of optically active alpha-methoxyaryl acetic acids (up to 95% ee), alpha-methoxyaryl ethanols (up to 93% ee) and alpha-methoxyaryl acetonitriles (up to 93% ee) was achieved via Arthrobacter sp. lipase-catalyzed kinetic resolution of masked aldehydes as the key synthons, that is, alpha-hydroxyaryl acetaldehyde acetals. (C) 2008 Elsevier Ltd. All rights reserved.
Rapid synthesis of the tetrahydroquinoline alkaloids: angustureine, cuspareine and galipinine
作者:Aisling O'Byrne、Paul Evans
DOI:10.1016/j.tet.2008.06.073
日期:2008.8
A one-pot method for the preparation of 1,2-substituted dihydroquinolines is described. This method features the C-2 addition of a range of organolithium reagents to quinoline followed by the in-situ addition of an electrophile. Standard palladium-catalysed hydrogenation, of the resultant 1,2-disubstituted dihydroquinoline adducts, generates the corresponding 1,2-disubstituted tetrahydroquinoline. A series of such compounds have been synthesised including the natural products; (+/-)-angustureine 1, cuspareine 2 and galipinine 3. (C) 2008 Elsevier Ltd. All rights reserved.