81474-37-5Relevant articles and documents
FROM PENICILLIN TO PENEM AND CARBAPENEM. 1. RACEMIZATION OF 6,6-DIBROMO SECOPENICILLIN, AND SYNTHESIS OF 2-OXO PENAM DERIVATIVE
Hirai, Koichi,Iwano, Yuji,Fujimoto, Katsumi
, p. 201 - 207 (2007/10/02)
From 6-APA the azetidinone derivative (7) which has (R)-hydroxyethyl substituent at C-6 was prepared effectively.From dibromoseco derivative (10) the same type of compounds, 17 and 18 which has (S) type substituent were prepared, however these were proved to be optically inactive dl-form.Racemization occurred during the proces of the formation of the secopenicillin (10) with excess CH3I and 2.5 eq. of NaH or KO-t-Bu in THF via the acyliminium intermediate (22).The 2-oxo penam derivative (27) was prepared from 17 as shown in Fig. 4.