Diastereoselective strecker synthesis using α-phenylglycinol as chiral auxiliary
摘要:
Use of alpha-phenylglycinol as chiral auxiliary in Strecker synthesis ensures high diastereoselectivity and its easy removal by oxidative cleavage allows large scale preparation of optically active alpha-amino acids.
The high diastereoselectivity achieved in Strecker synthesis using inexpensive α-phenylglycinol as chiral auxiliary and its facile removal by oxidative cleavage make it an ideal choice for the large scale preparations of optically active α-aminoacids specially α-arylglycines present abundantly in glycopeptide antibiotics. A number of chiral amino acids are synthesized following this method. Also molecular
L-α-Amino acids including L-α-arylglycines were conveniently and stereoselectively synthesized via the α-amino carbonitriles given by the Strecker reaction of (R)-2-amino-2-phenylethanol with aldehydes and hydrogen cyanide. The stereoselectivity of these α-amino carbonitriles was thermodynamically controlled.