title: Total synthesis of (+)-batzelladine A and (-)-batzelladine D, and identification of their target protein.
abstract: Asymmetric total synthesis of batzelladine A (1) and batzelladine D (2) has been achieved. Our synthesis of batzelladines features 1) stereoselective construction of the cyclic guanidine system by means of successive 1,3-dipolar cycloaddition reaction and subsequent cyclization, 2) direct esterification of the bicyclic carboxylic acid 35 with the guanidine alcohol 8 or 59 to construct the whole carbon skeleton of batzelladines, and 3) one-step formation of the alpha,beta-unsaturated aldehyde 53 from the primary alcohol 47 with tetra-n-propylammoniumperruthenate (TPAP), providing an efficient route to the left-hand bicyclic guanidine alcohol of batzelladine A (1). With the synthetic compounds 1 and 2 in hand, their target protein was examined by using immobilized CD4 and gp120 affinity gels. The results indicated that batzelladines A (1) and D (2) bind specifically to CD4.
authors.affiliation: Institute of Molecular and Cellular Biosciences, University of Tokyo, Bunkyo-ku, Tokyo 113-0032, Japan.
authors.forename: Jun
authors.initials: J
authors.lastname: Shimokawa
authors.forename: Takanori
authors.initials: T
authors.lastname: Ishiwata
authors.forename: Koji
authors.initials: K
authors.lastname: Shirai
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Koshino
authors.forename: Aya
authors.initials: A
authors.lastname: Tanatani
authors.forename: Tadashi
authors.initials: T
authors.lastname: Nakata
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Hashimoto
authors.forename: Kazuo
authors.initials: K
authors.lastname: Nagasawa
mesh_terms: D000470:Alkaloids / Q000138:chemical synthesis* / Q000737:chemistry; D006146:Guanidines / Q000138:chemical synthesis* / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D011506:Proteins / Q000737:chemistry*; D011743:Pyrimidines / Q000138:chemical synthesis* / Q000737:chemistry; D016339:Spectrometry, Mass, Fast Atom Bombardment; D013055:Spectrophotometry, Infrared; D013237:Stereoisomerism
chemical_list: D000470:Alkaloids; D006146:Guanidines; D011506:Proteins; D011743:Pyrimidines; C438977:batzelladine A; C410707:batzelladine D