ethyl 2-isocyanato-2-methylpropanoate

Conditions: temp:0.00; pressure:0.00; stir:

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

Procedure: The 2(R)-[1(S)-[(tetrahydro-2(RS)-pyranyloxy)carbamoyl]-4-phenylbutyl]-4-methyl-N-(4,4-dimethyl-2,5-dioxo-1-imidazolidinyl)valeramide used as the starting material was prepared in a manner analogous to that described in Example 7, part (ii) and Example 1, parts (vii) and (viii), starting from 2(R)-[1(S)-(tert-butoxycarbonyl)-4-phenylbutyl]-4-methylvalerohydrazide and ethyl 2-isocyanato-2-methylpropionate. was prepared in a manner analogous to

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

Procedure: The 2(R)-[1(S)-[(tetrahydro-2(RS)-pyranyloxy)carbamoyl]-4-phenylbutyl]-4-methyl-N-(4,4-dimethyl-2,5-dioxo-1-imidazolidinyl)valeramide used as the starting material was prepared in a manner analogous to that described in Example 7, part (ii) and Example 1, parts (vii) and (viii), starting from 2(R)-[1(S)-(tert-butoxycarbonyl)-4-phenylbutyl]-4-methylvalerohydrazide and ethyl 2-isocyanato-2-methylpropionate. was prepared in a manner analogous to