Preparation of, and alkylation of enolate anions with, dimethyl 3-bromo-2 ethoxypropenylphosphonate. An efficient, convergent synthesis of 2-cyclo-penten-1-ones
作者:Edward Piers、Brian Abeysekera、John R. Scheffer
DOI:10.1016/s0040-4039(01)95384-5
日期:1979.1
The alkylation of enolateanions with dimethyl 3-bromo-2-ethoxypropenylphosphonate, followed by acid hydrolysis of the resultant products, affords diketo phosphonate compounds which can be cyclized efficiently to give the corresponding 2-cyclopenten-1-ones. This overall five-membered ring annelation process can be carried out without affecting acid-labile functional groups (e.g. ketal) in the enolate
PIERS E.; ABEYSEKERA B.; SCHEFFER J. R., TETRAHEDRON LETT., 1979, NO 35, 3279-3282
作者:PIERS E.、 ABEYSEKERA B.、 SCHEFFER J. R.
DOI:——
日期:——
PIERS, E.;ABEYSEKERA, B., CAN. J. CHEM., 1982, 60, N 9, 1114-1121
作者:PIERS, E.、ABEYSEKERA, B.
DOI:——
日期:——
Alkylation of enolate anions with dimethyl 3-bromo-2-ethoxypropenylphosphonate. A convergent cyclopentenone annulation method
作者:Edward Piers、Brian Abeysekera
DOI:10.1139/v82-166
日期:1982.5.1
with excess triethyl orthoformate in the presence of ferric chloride hexahydrate provides the enol ether 22, which upon allylic bromination with N-bromosuccinimide yields the allylic bromide 19. Alkylation of the ketones 24–28 with 19, followed by mild acid hydrolysis of the resultant products 29–33, affords the diketo phosphonates 34–38. When the latter substances are treated with sodium hydride in