. 2016 Oct 21;8(2):1511–1524. doi: 10.1039/c6sc04273b

Table 1. Diels–Alder-initiated, stereodivergent organocascades with racemic dienes (±)-13a–d providing bi- and tricyclic γ-lactones 14a–d ^a .


Entry	Diene	Acid chloride	Cycloadducts % yield (endo : exo, % ee)
1		12a
2		12a
3		12a
4		12b

^aUnless otherwise specified, all reactions were performed with diene (1.0 equiv.), acid chloride (1.5 equiv.), K₃PO₄ (3.0 equiv.), 2,6-lutidine (20 mol%), and (S)-(–)-BTM (20 mol%) at 23 °C for 18 h. Yields are based on isolated, purified cycloadducts. Enantiomeric excess was determined by chiral phase HPLC.

Table 1. Diels–Alder-initiated, stereodivergent organocascades with racemic dienes (±)-13a–d providing bi- and tricyclic γ-lactones 14a–d a .

Table 1. Diels–Alder-initiated, stereodivergent organocascades with racemic dienes (±)-13a–d providing bi- and tricyclic γ-lactones 14a–d ^a .