Reaction of the N-(α-chloroalkyloxycarbonyl)pyrrolidines 1 with lithium powder and a catalytic amount of 4,4′-di-tert-butylbiphenyl (DTBB, 2.5 mol-%) in the presence of different electrophiles [iBuCHO, tBuCHO, PhCHO, Et2CO, (CH2)5CO, PhCOMe, Ph2CO, Me3SiCl], in THF at temperatures ranging between –78 and –60°C leads, after hydrolysis with water, to the expected functionalized carbamates 2. Deprotection
Trichloromethyl carbonate as a practical phosgene source: Application to the synthesis of α-chloro chloroformates
作者:Michael J. Coghlan、Blake A. Caley
DOI:10.1016/s0040-4039(01)93704-9
日期:1989.1
Trichloromethyl carbonate 1 is used as a phosgene source in the preparation of α-chloro chloroformates. This stable, crystalline reagent smoothly delivers products 3 in good yield under mild conditions.
A compound of the formula:
or a pharmaceutical acceptable salt thereof, processes for preparing the same and a pharmaceutical composition containing the compound or the salt thereof mentioned above are provided. The compound has antibiotic activity and has improved absorbability.
COGHLAN, MICHAEL J.;CALEY, BLAKE A., TETRAHEDRON LETT., 30,(1989) N6, C. 2033-2036
作者:COGHLAN, MICHAEL J.、CALEY, BLAKE A.
DOI:——
日期:——
Improving Drug Delivery While Tailoring Prodrug Activation to Modulate <i>C</i><sub>max</sub> and <i>C</i><sub>min</sub> by Optimization of (Carbonyl)oxyalkyl Linker-Based Prodrugs of Atazanavir
作者:Murugaiah A. M. Subbaiah、Lakshumanan Subramani、Thangeswaran Ramar、Salil Desai、Sarmistha Sinha、Sandhya Mandlekar、John F. Kadow、Susan Jenkins、Mark Krystal、Murali Subramanian、Srikanth Sridhar、Shweta Padmanabhan、Priyadeep Bhutani、Rambabu Arla、Nicholas A. Meanwell