1.1: sodium azide / methanol / 72 h / 80 °C / |Inert atmosphere 2.1: 4-methyl-morpholine; isobutyl chloroformate / tetrahydrofuran / 0.08 h / 0 °C / |Inert atmosphere 2.2: 24 h / 20 °C / |Inert atmosphere 3.1: tributylphosphine / tetrahydrofuran / |Inert atmosphere; |Microwave irradiation View Scheme

1.1: 4-methyl-morpholine; isobutyl chloroformate / tetrahydrofuran / 0.08 h / 0 °C / |Inert atmosphere 1.2: 24 h / 20 °C / |Inert atmosphere 2.1: tributylphosphine / tetrahydrofuran / |Inert atmosphere; |Microwave irradiation View Scheme

tributylphosphine in tetrahydrofuran Inert atmosphereMicrowave irradiation; Activation energy;