Rapid microwave-assisted deprotection of N-Cbz and N-Bn derivatives
摘要:
Catalytic-transfer hydrogenation in ifo-propanol under microwave irradiation has been performed to rapidly deprotect N-Cbz and N-Bn derivatives. The method is particularly suitable for the synthesis of short peptides and can also be carried out on supported molecules. The rapid cleavage of chiral molecules derived from (S)-1-phenylethylamine can be very useful for asymmetric synthesis of nitrogen containing compounds. (C) 2001 Elsevier Science Ltd. All rights reserved.
One-pot synthesis of α-aminonitriles from alkyl and aryl cyanides: a Strecker reaction via aldimine alanes
作者:Szabolcs Sipos、István Jablonkai
DOI:10.1016/j.tetlet.2009.02.004
日期:2009.4
A one-pot Strecker reaction using various alkyl, arylalkyl and arylnitriles is developed. Aldimine alanes were generated in situ from nitriles by the addition of diisobutylaluminium hydride, and were converted into the corresponding imines on reaction with (S)-(-)-1-phenylethylamine. Nucleophilic addition to the imines in the presence of catalytic triethylamine, using acetone cyanohydrin as a cyanide source, provided alpha-aminonitriles. (C) 2009 Elsevier Ltd. All rights reserved.
Rapid microwave-assisted deprotection of N-Cbz and N-Bn derivatives
Catalytic-transfer hydrogenation in ifo-propanol under microwave irradiation has been performed to rapidly deprotect N-Cbz and N-Bn derivatives. The method is particularly suitable for the synthesis of short peptides and can also be carried out on supported molecules. The rapid cleavage of chiral molecules derived from (S)-1-phenylethylamine can be very useful for asymmetric synthesis of nitrogen containing compounds. (C) 2001 Elsevier Science Ltd. All rights reserved.
Asymmetric Strecker Reaction with Chiral Amines: a Catalyst-Free Protocol Using Acetone Cyanohydrin in Water
The synthesis of a series of new chiral α-aminonitriles was achieved in a diastereoselective Strecker reaction in a one-pot procedure with aldehydes, enantiopure amines, and acetone cyanohydrin in water. Primary and secondary amines derived from L-α-amino acids were used as sources of chirality. The reactions proceeded efficiently without any catalyst at room temperature. The diastereoselectivity of