944324-95-2Relevant articles and documents
Enantioselective synthesis of (+)-l-733,060
Cherian, Shijo K.,Kumar, Pradeep
, p. 982 - 987 (2007)
An efficient enantioselective synthesis of (+)-l-733,060 from cinnamyl alcohol is described. The key steps include a Sharpless asymmetric epoxidation, a regioselective allyl opening of an epoxide and piperidine ring formation via a one pot Staudinger/aza-Wittig reaction.
Phosphonate analogs of N-benzoyl-and N-Boc-3-phenylisoserine, the taxol C-13 side chain
Wroblewski, Andrzej E.,Piotrowska, Dorota G.
, p. 8123 - 8132 (2007/10/03)
Diastereoselectivity of the addition of diethyl phosphite to N-Boc-phenylglycinal reached 50% when NEt3 or KF were used as catalysts but employing lithium diethyl phosphonate lower d.e. was obtained. Separation of the required syn diethyl 2-[(tert- butoxycarbonyl)amino]-1-hydroxy-2-phenylethylphosphonate (8a) from the antiisomer 8b was best achieved as O-benzoate 10a or O- trimethylsilyl 9a derivatives. Diethyl 2-(benzoylamino)-1-hydroxy- 2-phenylethylphosphonate (12a) was efficiently prepared (HCl- AcOEt) from 10a in a one-step procedure. The absolute configuration at C-1 in 8a and 8b was established from 1H and 13C NMR spectral data of their N,O-isopropylidene derivatives. Acyclic phosphonates from the a series (8, 10, 12) adopt antiperiplanar conformations.