NEW SYNTHESES OF SOME FUNCTIONALIZED AND ACETYLENIC BETA-KETO PHOSPHONATES

beta-Keto phosphonates omega-functionalized by an ester group 1a-f, by a hydroxyl 5, and with a triple bond conjugated to the carbonyl group 2a-c were prepared by reacting dimethyl (lithiomethyl)phosphonate (3) with adequate electrophiles. Cyclic anhydrides such as succinic, and- glutaric anhydrides were employed for the synthesis of the two first homologs 1a and 1b. To obtain the other longer homologs 1c-f, 3-acylthiazolidine-2-thiones 7a-d easily prepared using cheap 2-mercaptothiazoline proved to be the electrophiles of choice. On the other hand, the synthesis of keto phosphonates 2a-c required the use of N-methoxy-N-methylamides.