Synthesis 2001(11): 1623-1626
DOI: 10.1055/s-2001-16751
PAPER
© Georg Thieme Verlag Stuttgart · New York

One-Step Synthesis of 2-Phosphonothiolanes by a New Pummerer-Phosphorylation Reaction: Stereoselective S-Oxidation

Patrice Marchand, Mihaela Gulea, Serge Masson*, Marie-Thérèse Averbuch-Pouchot
Laboratoire de Chimie Moléculaire et Thioorganique UMR 6507 CNRS, ISMRA-Université de Caen, 6, Bd du Maréchal Juin, 14050 Caen, France
Fax: +33(2)31452877; e-Mail: serge.masson@ismra.fr;
Further Information

Publication History

Received 6 February 2001
Publication Date:
12 August 2004 (online)

Abstract

A new one-pot Pummerer phosphorylation reaction allowed an efficient synthesis of 2-phosphonothiolanes starting from thiolane S-oxide and trialkyl phosphites. The S-oxidation of these cyclic sulfides occurred with a total trans-stereoselectivity.

7

Various solvents (CH2Cl2, Et2O, THF, CHCl3) and reagents (TFAA or TMSOTf, Ac2O, ClSiMe3) were used from r. t. to -78 °C.

8

The modest yield obtained with (MeO)3P is due to the sensitivity of the corresponding phosphonate ester in acidic medium (partial demethylation leading to phosphonic acid derivatives).

10

Compared to the previous work (see Ref. 4) no asymmetry was induced by the menthyl groups.

13

Atomic coordinates for 4e can be obtained on request from the Director, Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge, CB2 IEZ, UK. The crystal structure has been allocated the deposition number CCDC 142975.