of glutaraldehyde with (R)-(−)-phenylglycinol and triethylphosphite to give 2-ethylphosphonate-6-oxazolopiperidine 2 which furnished in few steps (S)-(+)-piperidin-2yl-phosphonic acid (5) in 58% ee. The second strategy utilizes the 2-cyano-6-oxazolopiperidine synthon 1 which upon treatment with trimethyl phosphite gave 2-cyano-6-oxazaphosphorinane 7 which gave pure (R)-(−)-piperidin-2-yl-phosphonic
Regioselective α-Phosphonylation of Unprotected Alicyclic Amines
作者:Bowen Li、Fuchao Yu、Weijie Chen、Daniel Seidel
DOI:10.1021/acs.orglett.4c02037
日期:2024.7.19
Unprotected alicyclic amines undergo α-C–H bond phosphonylation via a two-stage one-pot process involving the oxidation of amine-derived lithium amides with simple ketone oxidants, generating transient imines which are then captured with phosphites or phosphine oxides. Amines with an existing α-substituent undergo regioselective α′-phosphonylation. Amine α-arylation and α′-phosphonylation can be combined