Реакция #1269810

Уравнение реакции

methyl chloroformate

3-butyn-1-ol

THF

NH4Cl

Butyl lithium

→

methyl 5-(tetrahydro-2H-pyran-2-yloxy)-2-pentynoate

Выход 65.0%

Условия реакции

Обработка

1. 1
   workup.STIRRINGThe resulting mixture was stirred at about −75° C. for about 30 min
2. 2
   Температураslowly warmed to about 25° C. in approximately 2 h
3. 3
   ЭкстракцияThe organic material was extracted with hexanes/ether, approximately 1:1
4. 4
   ПромывкаThe combined extracts were washed with brine
5. 5
   Другоеdried
6. 6
   ДругоеAfter removal of the solvent
7. 7
   Другоеon a rotary evaporator
8. 8
   Другоеchromatographed on silica gel with hexanes/ethyl acetate, approximately 4:1

Методика

A solution of the THPO-ether of 3-butyn-1-ol (approximately 2.88 g, approximately 18.7 mmol) in THF (about 40 ml, dried with sodium benzophenone ketyl) was placed under N2 into a four-neck flask and cooled to about −75° C. Butyl lithium (approximately 18.7 mmol, approximately 9.4 ml of approximately 2.0 M in hexanes) was added slowly via a dropping funnel at about −75° C. The mixture was stirred at this temperature for about 30 min, and then methyl chloroformate (ClCOOMe, about 1.4 ml, about 18.7 mmol) was added. The resulting mixture was stirred at about −75° C. for about 30 min, then slowly warmed to about 25° C. in approximately 2 h and poured into a cold saturated NH4Cl solution. The organic material was extracted with hexanes/ether, approximately 1:1. The combined extracts were washed with brine and dried. After removal of the solvent on a rotary evaporator, the remainder was flash chromatographed on silica gel with hexanes/ethyl acetate, approximately 4:1, to isolate methyl 5-(tetrahydro-2H-pyran-2-yloxy)-2-pentynoate (approximately 2.5 g, approximately 65%). GC-MS (m/z, relative intensity): 211 (1, M+-1), 157 (4), 153 (3), 142 (4), 125 (18), 113 (9), 109 (11), 85 (100), 79 (41), 67 (18), 55 (16), 41 (26). 1H NMR (CDCl3): 1.50-1.64 (m, 4H), 1.72 (m, 1H), 1.83 (m, 1H), 2.66 (t, J=6.6 Hz, 2H, H-4), 3.53 (m, 1H, H-5A), 3.62 (dt, J=9.8, 7.5 Hz, 1H, H-5B), 3.77 (s, 3H, OCH3), 3.87 (m, 2H), 4.65 (br t, J=4.0 Hz, 1H, OCHO). 1H NMR data were in agreement with data obtained for this compound in CCl4 (Rama Rao et al. 1986).

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