Ozonization and reduction of α-methylene N-(ethoxycarbonyl)-β-amino phosphonic esters
摘要:
N-(Ethoxycarbonyl)-beta-amino-alpha-methylene phosphonic esters give N-(ethoxycarbonyl)-beta-amino-alpha-hydroxy phosphonic esters by ozonization and subsequent reduction with a large excess of NaBH4. If there is a small excess of NaBH4 or if the intermediate is treated with methanolic NaOH-CH2Cl2 an anomalous ozonolysis occurs, affording N-(ethoxycarbonyl)-alpha-amino methyl carboxylic esters due to the cleavage of both the C=C double bond and the adjacent C-P single bond. C) 2002 Elsevier Science Ltd. All rights reserved.