Synthesis of (<i>Z</i>)-Alkene and (<i>E</i>)-Fluoroalkene-Containing Diketopiperazine Mimetics Utilizing Organocopper-Mediated Reduction−Alkylation and Diastereoselectivity Examination Using DFT Calculations
by trapping the resulting metal dienolate with an electrophile in a one-pot procedure gave α-alkylated-β,γ-unsaturated-δ-lactams in good yields. Because of side-chain steric repulsion, we found that alkylation using relatively large electrophiles such as BnBr gave mostly 3,6-trans isomers by kinetic trapping of metal enolates. On the other hand, MeI-mediated alkylations predominantly provided the unexpected
Design and synthesis of dipeptidyl α′,β′-epoxy ketones, potent irreversible inhibitors of the cysteine protease cruzain
作者:William R Roush、Florenci V González、James H McKerrow、Elizabeth Hansell
DOI:10.1016/s0960-894x(98)00494-6
日期:1998.10
The dipeptidyl epoxy ketone 4 is a potent, irreversibleinhibitor of cruzain, a cysteineprotease isolated from Trypanosoma cruzi, with an apparent second order inhibition rate constant of 330,000 sec-1M-1.
A general route for the synthesis of enantiopure indolizidine alkaloids from α-amino acids. Total synthesis of (+)-Monomorine
作者:Steven R. Angle、J.Guy Breitenbucher
DOI:10.1016/s0040-4039(00)60596-8
日期:1993.6
The ant trail pheromone (+)-Monomorine was synthesized in 9 steps from N-t-BOC-L-alanine ethyl ester. The key step of the synthesis is the conformationally restricted Claisen rearrangement of lactone 9 to pipecolic ester 11.