77856-53-2Relevant articles and documents
Total synthesis of lipogrammistin-A: Efficient macrocyclization with 2-nitrobenzenesulfonamide
Fujiwara,Kan,Fukuyama
, p. 1667 - 1669 (2007/10/03)
Total synthesis of lipogrammistin-A (1) was accomplished using a 2-nitrobenzenesulfonyl (Ns) group for both protection and activation of amines. The β-amino ester derivative 16 was synthesized from carboxylic acid 12 in six steps by way of reduction to the aldehyde and the subsequent Wittig olefination. N-Alkylation of the Ns group under Mitsunobu conditions followed by amide formation provided 20. Intramolecular alkylation of the Ns group in 20 gave the 18-membered ring 21 as the exclusive product. After removal of the Ns group, selective acylation of the two of the three amino groups with (S)-2-methylbutyric acid furnished the desired compound 1.
Stereoselective reactions. IX. Synthetic studies on optically active β-lactams. I. Chiral synthesis of carbapenam and carbapenem ring systems starting from (S)-aspartic acid
Ikota,Shibata,Koga
, p. 3299 - 3306 (2007/10/02)
-
Synthesis of (S)- and (R)-4--2-azetidinone by Chemicoenzymatic Approach
Ohno, Masaji,Kobayashi, Susumu,Iimori, Takamasa,Wang, Yi-Fong,Izawa, Toshio
, p. 2405 - 2406 (2007/10/02)
-