Preparation of Alkyl-Substituted Indoles in the Benzene Portion. Part 7. Synthesis of (.+-.)- and (S)-(-)-Pindolol.
作者:Masahiro FUJI、Hideaki MURATAKE、Manami AKIYAMA、Mitsutaka NATSUME
DOI:10.1248/cpb.40.2353
日期:——
A new, short-step synthesis of a β-adrenergic blocking agent, pindolol, 1-(4-indolyloxy)-3-(2-propylamino)-2-propanol, is described. The acid-catalyzed indole cyclization reaction of 4-[1-(4-methylphenyl)sulfonyl-3-phrroly]-4-oxobutanal (14) in the presence of (±)-3-chloro-1, 2-propanediol (12) and (R)-1-O-[(4-methylphenyl)sulfonyl]glycerol (24) afforded (±)-1-chloro-3-[1-(4-methylphenyl)sulfonyl-4-indolyloxy]-2-propanol (15) and (R)-(-)-3-[1-(4-methyl-phenyl)sulfonyl-4-indolyloxy]-1-[(4-methylphenyl)sulfonyloxy]-2-propanol (25). Reaction of these with isoproplamine and removal of the protecting group at the indole nitrogen gave (±)- and (S)-(-)-pindolol (3 and 4), thus constituting an efficient three-step synthesis of 3 and 4 from the readily available aldehyde (14).
描述了一种新的短步合成β-肾上腺素能阻断剂心得安(1-(4-吲哚氧基)-3-(2-丙胺基)-2-丙醇)的方法。在酸催化下,4-[1-(4-甲基苯基)磺酰-3-吡咯基]-4-氧丁醛(14)与(±)-3-氯-1,2-丙二醇(12)和(R)-1-O-[(4-甲基苯基)磺酰]甘油(24)反应,得到(±)-1-氯-3-[1-(4-甲基苯基)磺酰-4-吲哚氧基]-2-丙醇(15)和(R)-(-)-3-[1-(4-甲基苯基)磺酰-4-吲哚氧基]-1-[(4-甲基苯基)磺酰氧基]-2-丙醇(25)。这些化合物与异丙胺反应并除去吲哚氮上的保护基团,得到了(±)-和(S)-(-)-心得安(3和4),从而构成了从 readily available aldehyde (14)出发的高效三步合成的3和4的合成方法。