2-methoxy-4,5-dimethyl-1,3,2-dioxaphospholane

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

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

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

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

Procedure: Using the procedure of Step A of Example 1, 2.03 g of isopropyl bromoacetate and 1.3 g of 2-methoxy-4,5-dimethyl-1,3,2-dioxaphospholane were reacted to obtain 1.94 g of raw 2-isopropoxycarbonylmethyl-4,5-dimethyl-2-oxo-1,3,2-dioxaphospholane used as is for the next step. were reacted

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

Procedure: Using the procedure of Step A of Example 1, 3.8 g of n-propyl bromoacetate and 2.42 g of 2-methoxy-4,5-dimethyl -1,3,2-dioxaphospholane were reacted to obtain 3.62 g of raw 2-propoxycarbonylmethyl-4,5-dimethyl-2-oxo-1,3,2-dioxaphospholane which was used as is for the next step. were reacted

Conditions: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 300 g of trimethyl phosphite and 200 ml of 2,3-butanediol was heated to 100° C. and the methanol formed was distilled off to obtain 170 g of 2-methoxy-4,5-dimethyl-1,3,2-dioxaphospholane with a boiling point of 66° C. at 20 mm Hg, 37 g of the said product were added over two hours to 62.5 g of tert.-butyl bromoacetate heated to 115° C. under reduced pressure of 140 mm Hg and the volatile products were removed under reduced pressure to obtain 59 g of 2-tert.-butoxycarbonylmethyl-4,5-dimethyl-2-oxo-1,3,2-dioxaphospholane which slowly crystallized. was distilled off