Hydrochloric Acid → HCID 178476781, compound

Participants

Reaction Conditions

Reaction Steps

A 1-L 3-neck round-bottom flask was fitted with an addition funnel and the atmosphere was purged with nitrogen. Anhydrous, degassed THF (170 mL) was added to the 1-L flask and cooled to −60 ° C. (internal temperature). The addition funnel was charged with hexyllithium (2.38 M in hexanes, 57 mL, 135 mmol, 2.0 equiv). The hexyllithium was transferred into the cold THF over 20 min, maintaining the temperature below −40 ° C. The solution was re-cooled to −60 ° C. (internal temperature). A solution of 2′-iodo-2,4,6-triisopropylbiphenyl (27.5 g, 67.7 mmol, 1.0 equiv) in 170 mL of anhydrous, degassed THF was transferred, via cannula, drop wise to the n-hexyllithium solution. This was done over 25 min while maintaining the temperature below −40 ° C. After addition, the reaction mixture was allowed to stir at −60 ° C. for 30 min. Diethyl chlorophosphite (19.62 mL, 135 mmol, 2.0equiv) was added to the reaction mixture, over 10 min while maintaining the temperature below −40 ° C. After addition of diethyl chlorophosphite, the reaction was allowed to proceed at −60 ° C. for an additional 30 min. Aqueous hydrochloric acid (1 M, 338 mL, 338 mmol) was added at −60 ° C. The flask was removed from the cold bath and the reaction was allowed to warm to 22 ° C. The resultant solution was diluted with heptane (340 mL) and transferred to a separatory funnel. The layers were separated and the organic layer was assayed for product by quantitative HPLC (94% yield). The organic layer was concentrated under reduced pressure to give an oil which was used in the next reaction without further purification.

Provenance & Evidence