β-Lactams derived from phenylalanine and homologues: effects of the distance between the aromatic rings and the α-stereogenic reactive center on the memory of chirality
摘要:
The enantioselectivity in the base-promoted cyclization of N-chloroacetyl derivatives of Phe, Phg, and Hph is dependent on the side-chain length, with the best results for Phg analogues (up to 74% ee). In contrast, shortening of the N-substituent, from a (p-methoxy)benzyl group to a (p-methoxy)phenyl moiety, led to a decrease in selectivity. (c) 2006 Elsevier Ltd. All rights reserved.
β-Lactams derived from phenylalanine and homologues: effects of the distance between the aromatic rings and the α-stereogenic reactive center on the memory of chirality
摘要:
The enantioselectivity in the base-promoted cyclization of N-chloroacetyl derivatives of Phe, Phg, and Hph is dependent on the side-chain length, with the best results for Phg analogues (up to 74% ee). In contrast, shortening of the N-substituent, from a (p-methoxy)benzyl group to a (p-methoxy)phenyl moiety, led to a decrease in selectivity. (c) 2006 Elsevier Ltd. All rights reserved.
An efficient green protocol for the preparation of acetoacetamides and application of the methodology to a one-pot synthesis of Biginelli dihydropyrimidines. Expansion of dihydropyrimidine topological chemical space
作者:Fernando H. S. Gama、Rodrigo O. M. A. de Souza、Simon J. Garden
DOI:10.1039/c5ra14355a
日期:——
A one pot synthesis of Biginelli dihydropyrimidines. The novel use of the amino acids allows topological diversification of the chemical space.
Catalyzed by a rhodium complex of P-stereogenic diphosphine ligand trichickenfootphos (TCFP), asymmetric hydrogenation of racemic aldimines via dynamic kineticresolution has been realized for the preparation of chiral arylglycines with good yields and enantioselectivities.
Disclosed are the ERK inhibitors of formula (1.0), having a pyrazolopyridine base structure, and the pharmaceutically acceptable salts thereof. Also disclosed are methods of treating cancer using the compounds of formula (1.0).
Disclosed are the ERK inhibitors of formula (1.0), having a pyrazolopyridine base structure, and the pharmaceutically acceptable salts thereof. Also disclosed are methods of treating cancer using the compounds of formula (1.0).