A concise approach to functionalised, homochiral pyrrolidinones
作者:Mark J Bamford、Mark Beard、David T Cherry、Mark G Moloney
DOI:10.1016/0957-4166(95)00007-c
日期:1995.2
Acylation of O,N-acetal 1 gives excellent yields of the C-7 substituted products 2a,b. Alkylation of 2a under mild conditions gives high yields of the exo- 3 and endo- 4 substituted products in varying ratios, depending on the alkylating agent. The unsaturated derivative 8 reacts in high yields under mild conditions with dienes and 1,3-dipoles to give the corresponding cycloadducts. Elaboration of these compounds by acidic deprotection to substituted pyroglutaminols, and oxidation to the corresponding pyroglutamates, can be readily achieved.
Amino acid synthesis using ()-pyroglutamic acid as a chiral starting material
作者:Jack E. Baldwin、Tania Miranda、Mark Moloney、Tuncer Hokelek
DOI:10.1016/s0040-4020(01)89208-5
日期:1989.1
hexamethyldisilazide (LiHMDS) in THF, followed by reaction with electrophiles, leads to the formation of 4-substituted pyroglutamates in good yield. This approach has been used for the synthesis of the novel amino acid (4).