Chemoenzymatic Synthesis of Pyrrolo[2,1-<i>b</i>]quinazolinones: Lipase-Catalyzed Resolution of Vasicinone
Ähmed KamalDivision of Organic Chemistry-I, Indian Institute of Chemical Technology, Hyderabad-500 007, IndiaK. V. RamanaDivision of Organic Chemistry-I, Indian Institute of Chemical Technology, Hyderabad-500 007, IndiaM. V. Prabhakara RaoDivision of Organic Chemistry-I, Indian Institute of Chemical Technology, Hyderabad-500 007, India
2001en
ABI
Abstract
A facile synthesis of bronchodilatory pyrrolo[2,1-b]quinazoline alkaloids by azidoreductive cyclization strategy employing TMSCl−NaI and bakers' yeast is described. Both the chemical and enzymatic methods are mild and take place at room temperature in good yields. Further, synthesis and resolution of vasicinone has been carried out by employing different lipases. It has been observed that lipase PS provides acetate of (S)-vasicinone in 98% ee.
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