Dichloromethane → HCID 86670148, compound

Participants

Reaction Steps

(R)-2-Chloro-5,6,6a,7,9,10-hexahydro-[1,4]oxazino[3,4-h]pteridine (PREPARATION x3, 200 mg, 0.882 mmol) and 2-methyl-5-oxopentan-2-yl acetate (55.8 mg, 0.353 mmol) were combined in a 25 mL pear flask to give an orange suspension. Titanium(IV) chloride in DCM (1M, 0.971 mL, 0.971 mmol) was added at room temperature to give a deep-red suspension, which was stirred at room temperature for 1 hour before being cooled to 0° C. Sodium triacetoxyborohydride (281 mg, 1.324 mmol) was added at 0° C. in portions. The thick suspension slowly turned into a thinner, orange one with gas evolution. UPLC showed the reaction proceeded more than half-way after about 20 minutes. The reaction mixture was carefully quenched with brine, and was partitioned between saturated NaHCO3 and ethyl acetate. The aqueous layer was extracted a second time with ethyl acetate. The combined organic layers were dried over MgSO4, filtered, and concentrated to give the title compound, which was used without further purification. ESI-MS m/z [M+H]+ calc'd for C17H25ClN4O3, 369.17; found 396.2.

Provenance & Evidence