ethyl (3R)-3-hydroxy-5-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoate

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The intended compound (2-b) was prepared in a yield of 75% by a method similar to the process A in EXAMPLE 2, except that ethyl (3R)-5-tert-butoxycarbonylamino-3-hydroxypentanoate (2-a), obtained by the above process B, was used instead of ethyl (3R)-5-benzyloxycarbonylamino-3-hydroxypentanoate (2-a).